PowerPC Windows NT support

From-SVN: r10643

gcc/config/rs6000/t-winnt

+# Do not build libgcc1.
+LIBGCC1 =
+CROSS_LIBGCC1 =
+
+EXTRA_HEADERS = $(srcdir)/ginclude/ppc-asm.h
+
+# At present, we don't have a cross linker, so turn this off
+LIBGCC1_TEST = 
+
+# These are really part of libgcc1, but this will cause them to be
+# built correctly, so... [taken from t-sparclite]
+LIB2FUNCS_EXTRA = fp-bit.c dp-bit.c
+
+dp-bit.c: $(srcdir)/config/fp-bit.c
+	cat $(srcdir)/config/fp-bit.c > dp-bit.c
+
+fp-bit.c: $(srcdir)/config/fp-bit.c
+	echo '#define FLOAT' > fp-bit.c
+	cat $(srcdir)/config/fp-bit.c >> fp-bit.c
+
+# Build the libraries for both hard and soft floating point
+
+MULTILIB_OPTIONS = msoft-float
+MULTILIB_DIRNAMES = soft-float
+
+LIBGCC = stmp-multilib
+INSTALL_LIBGCC = install-multilib