Adjust to changed compilation environment (Makefiles setup) in 5.1-CURRENT.
Link with liblgcc_r when creating linuxthreads versions of shared
libraries.
Build linuxthreads version of libstdc++ and libsupc++ under 5.0-CURRENT.
Don't misuse DESTDIR when building linuxthreads version of libgcc.
Fix varargs warning under 5.0-CURRENT.
Don't try to register profiled libraries when NOPROFILE has been specified.
Don't try to register shared libraries when NOPIC has been specified.
Bump port revision.
PR: 38876