* gdbtk.c (Tcl_Alloc): Don't provide our own version of this if

	* gdbtk.c (Tcl_Alloc): Don't provide our own version of this if
	_WIN32.
	(Tcl_Realloc, Tcl_Free): Likewise.
	* configure.in: Check for cygwin32 environment.  Define and
	substitute WIN32LIBS and WIN32LDAPP.  Always set configdir to
	unix; setting it to win was for an old Tcl/Tk configuration
	scheme.
	* aclocal.m4 (CY_AC_LOAD_TKCONFIG): Substitute TK_BUILD_INCLUDES.
	* Makefile.in (TK_CFLAGS): Add @TK_BUILD_INCLUDES@.
	(WIN32LDAPP, WIN32LIBS): Define.
	(CLIBS): Add $(WIN32LIBS).
	(gdb): Use $(WIN32LDAPP).
	* configure: Rebuild.