Turn on gcj functionality in BCC, DMC, NT, OS/2, WCC makefiles

Turn on gcj functionality in BCC, DMC, NT, OS/2, WCC makefiles

* BCC_MAKEFILE (defines): Add -D GC_GCJ_SUPPORT.
* Makefile.direct (CFLAGS): Likewise.
* OS2_MAKEFILE (CFLAGS): Likewise.
* WCC_MAKEFILE (DEFS): Likewise.
* digimars.mak (DEFINES): Likewise.
* BCC_MAKEFILE (XXXOBJS): Add XXXgcj_mlc.obj.
* NT_MAKEFILE (CFLAGS_DEFAULT): New variable (value copied from .c.obj);
add -D GC_GCJ_SUPPORT.
* NT_MAKEFILE (OBJS): Add gcj_mlc.obj.
* OS2_MAKEFILE (OBJS): Likewise.
* WCC_MAKEFILE (OBJS): Likewise.
* digimars.mak (OBJS): Likewise.
* NT_MAKEFILE (.c.obj, .cpp.obj): Use CFLAGS_DEFAULT variable.