Add libraries for linker (else undefined references)

Without the boost system and filesystem libraries, the linker will fail with undefined references when compiling test. This adds those two libraries to the CMake rule for test.

I believe this shouldn't be specific to any system
(Ubuntu 11.10, 64 bit)

    /usr/bin/c++       CMakeFiles/test.dir/src/test/lexicon.o CMakeFiles/test.dir/src/test/pcfg_parser.o CMakeFiles/test.dir/src/test/tokenizer.o CMakeFiles/test.dir/src/test/pfp.o CMakeFiles/test.dir/src/test/main.o  -o test -rdynamic libpfp.so -lboost_thread -lboost_unit_test_framework -lboost_regex -licuio -licuuc -Wl,-rpath,/home/smerity/Coding/Reference/pfp
    CMakeFiles/test.dir/src/test/pfp.o: In function `pfp_parser_test::test_pfp_hash::test_method()':
    pfp.cpp:(.text+0x1b47): undefined reference to `boost::filesystem3::path::wchar_t_codecvt_facet()'
    pfp.cpp:(.text+0x1bac): undefined reference to `boost::filesystem3::path::wchar_t_codecvt_facet()'
    pfp.cpp:(.text+0x1bf0): undefined reference to `boost::filesystem3::path::operator/=(boost::filesystem3::path const&)'
    pfp.cpp:(.text+0x1c1c): undefined reference to `boost::filesystem3::detail::status(boost::filesystem3::path const&, boost::system::error_code*)'
    pfp.cpp:(.text+0x1d82): undefined reference to `boost::filesystem3::path::wchar_t_codecvt_facet()'
    pfp.cpp:(.text+0x1ddd): undefined reference to `boost::filesystem3::path::wchar_t_codecvt_facet()'
    pfp.cpp:(.text+0x1e18): undefined reference to `boost::filesystem3::path::operator/=(boost::filesystem3::path const&)'
    pfp.cpp:(.text+0x1e44): undefined reference to `boost::filesystem3::detail::status(boost::filesystem3::path const&, boost::system::error_code*)'
    pfp.cpp:(.text+0x1ebf): undefined reference to `boost::filesystem3::path::wchar_t_codecvt_facet()'
    pfp.cpp:(.text+0x1f1a): undefined reference to `boost::filesystem3::path::wchar_t_codecvt_facet()'
    pfp.cpp:(.text+0x1f5d): undefined reference to `boost::filesystem3::path::operator/=(boost::filesystem3::path const&)'
    pfp.cpp:(.text+0x1f9e): undefined reference to `boost::filesystem3::path::wchar_t_codecvt_facet()'
    pfp.cpp:(.text+0x1ff9): undefined reference to `boost::filesystem3::path::wchar_t_codecvt_facet()'
    pfp.cpp:(.text+0x2034): undefined reference to `boost::filesystem3::path::operator/=(boost::filesystem3::path const&)'
    pfp.cpp:(.text+0x206e): undefined reference to `boost::filesystem3::path::wchar_t_codecvt_facet()'
    pfp.cpp:(.text+0x20c9): undefined reference to `boost::filesystem3::path::wchar_t_codecvt_facet()'
    pfp.cpp:(.text+0x2104): undefined reference to `boost::filesystem3::path::operator/=(boost::filesystem3::path const&)'
    pfp.cpp:(.text+0x213e): undefined reference to `boost::filesystem3::path::wchar_t_codecvt_facet()'
    pfp.cpp:(.text+0x2199): undefined reference to `boost::filesystem3::path::wchar_t_codecvt_facet()'
    pfp.cpp:(.text+0x21d4): undefined reference to `boost::filesystem3::path::operator/=(boost::filesystem3::path const&)'
    pfp.cpp:(.text+0x2548): undefined reference to `boost::filesystem3::detail::status(boost::filesystem3::path const&, boost::system::error_code*)'
    pfp.cpp:(.text+0x289a): undefined reference to `boost::filesystem3::detail::status(boost::filesystem3::path const&, boost::system::error_code*)'
    pfp.cpp:(.text+0x290e): undefined reference to `boost::filesystem3::detail::status(boost::filesystem3::path const&, boost::system::error_code*)'
    pfp.cpp:(.text+0x2982): undefined reference to `boost::filesystem3::detail::status(boost::filesystem3::path const&, boost::system::error_code*)'
    pfp.cpp:(.text+0x2a7c): undefined reference to `boost::filesystem3::path::wchar_t_codecvt_facet()'
    pfp.cpp:(.text+0x2ad7): undefined reference to `boost::filesystem3::path::wchar_t_codecvt_facet()'
    pfp.cpp:(.text+0x2b12): undefined reference to `boost::filesystem3::path::operator/=(boost::filesystem3::path const&)'
    pfp.cpp:(.text+0x2b3e): undefined reference to `boost::filesystem3::detail::status(boost::filesystem3::path const&, boost::system::error_code*)'
    pfp.cpp:(.text+0x2bb9): undefined reference to `boost::filesystem3::path::wchar_t_codecvt_facet()'
    pfp.cpp:(.text+0x2c14): undefined reference to `boost::filesystem3::path::wchar_t_codecvt_facet()'
    pfp.cpp:(.text+0x2c4f): undefined reference to `boost::filesystem3::path::operator/=(boost::filesystem3::path const&)'
    pfp.cpp:(.text+0x2c7b): undefined reference to `boost::filesystem3::detail::status(boost::filesystem3::path const&, boost::system::error_code*)'
    CMakeFiles/test.dir/src/test/pfp.o: In function `_GLOBAL__sub_I__ZN15pfp_parser_test13test_pfp_hash11test_methodEv':
    pfp.cpp:(.text.startup+0x3f): undefined reference to `boost::system::generic_category()'
    pfp.cpp:(.text.startup+0x4b): undefined reference to `boost::system::generic_category()'
    pfp.cpp:(.text.startup+0x57): undefined reference to `boost::system::system_category()'
    collect2: ld returned 1 exit status