* tlsmthread.c: Update to reflect changes in tlssup.c. * tlssup.c: code clean-up.
Implement TLS Callback. * tlsmcrt.c: New file. * tlsmthread.c: Ditto. * tlssup.c: Ditto. * tlsthrd.c: Ditto. * Makefile.in: Include new files. * crt1.c: Implement TLS Callback. * dllcrt1.c: Ditto. * mthr_stub.c: Remove.