Backpatch BCC compile changes to 8.0.X for psql.

src/bin/psql/bcc32.mak

src/bin/psql/command.c

src/bin/psql/startup.c

src/bin/psql/win32.mak

src/interfaces/libpq/Makefile

src/interfaces/libpq/bcc32.mak

src/interfaces/libpq/fe-exec.c

src/interfaces/libpq/pthread-win32.c

src/interfaces/libpq/win32.mak