For ASAN __cxa_throw interception to work, link python.bin to libstdc++

...where the intercepted __cxa_throw is found, as otherwise PythonTest_sw_python
fails with

AddressSanitizer CHECK failed: projects/compiler-rt/lib/asan/asan_interceptors.cc:293 "((IndirectExternCall(__interception::real___cxa_throw))) != (0)" (0x0, 0x0)
 #0 in __asan::AsanCheckFailed(char const*, int, char const*, unsigned long long, unsigned long long) projects/compiler-rt/lib/asan/asan_rtl.cc:70:3
 #1 in __sanitizer::CheckFailed(char const*, int, char const*, unsigned long long, unsigned long long) projects/compiler-rt/lib/sanitizer_common/sanitizer_common.cc:76:5
 #2 0x48c3ac in __cxa_throw projects/compiler-rt/lib/asan/asan_interceptors.cc:293:3
 #3 0x7f67faec0ef5 in pyuno::createClass(rtl::OUString const&, pyuno::Runtime const&) pyuno/source/module/pyuno_except.cxx:92:9
...

Change-Id: I0cb364eacab49644b426fb62f49bf9d7c8b5090c