Build Scrt.o on powerpc64. Its introduction on other platforms got lost

during the period of time the powerpc64 port was on a project branch.

lib/csu/powerpc64/Makefile

@@ -4,15 +4,14 @@
 
 SRCS=		crt1.c crti.S crtn.S
 OBJS=		${SRCS:N*.h:R:S/$/.o/g}
-OBJS+=		gcrt1.o
-CFLAGS+=	-Wall -Wno-unused \
-		-I${.CURDIR}/../common \
+OBJS+=		Scrt1.o gcrt1.o
+CFLAGS+=	-I${.CURDIR}/../common \
 		-I${.CURDIR}/../../libc/include
 
 all: ${OBJS}
 
 CLEANFILES=	${OBJS}
-CLEANFILES+=	crt1.s gcrt1.s
+CLEANFILES+=	crt1.s gcrt1.s Scrt1.s
 
 # See the comment in lib/csu/common/crtbrand.c for the reason crt1.c is not
 # directly compiled to .o files.
@@ -31,6 +30,13 @@ gcrt1.s: crt1.c
 gcrt1.o: gcrt1.s
 	${CC} ${CFLAGS} -c -o ${.TARGET} gcrt1.s
 
+Scrt1.s: crt1.c
+	${CC} ${CFLAGS} -fPIC -DPIC -S -o ${.TARGET} ${.CURDIR}/crt1.c
+	sed -i "" -e '/\.note\.ABI-tag/s/progbits/note/' ${.TARGET}
+
+Scrt1.o: Scrt1.s
+	${CC} ${CFLAGS} -c -o ${.TARGET} Scrt1.s
+
 realinstall:
 	${INSTALL} -o ${LIBOWN} -g ${LIBGRP} -m ${LIBMODE} \
 	    ${OBJS} ${DESTDIR}${LIBDIR}