Bug 885074 - Clean up old stuff in Makefiles, r=Standard8.

--HG--
extra : rebase_source : 2fcf112e9c68e7fde6fa88d5abb3482ae55dd1ea
Bug 901752 - Do not simultaneously define LIBXUL_LIBRARY and FORCE_STATIC_LIB, r=Standard8.

This is a requirement held by the mozilla-central build system, so necessary for
cc-rework to proceed.

--HG--
extra : rebase_source : e06cc7403c0a93a6d3b122f93ebd98bbe884bdc2
Bug 901568 - Move CPP_UNIT_TESTS to moz.build, r=Standard8.

--HG--
extra : rebase_source : 74c5f89e214db6817ca374d6a757a4db685f9b32
Bug 901567 - Move EXTRA_PP_JS_MODULES to moz.build, r=Standard8, a=Standard8.

CLOSED TREE seamonkey changes, too.