xbps: use both cflags and ldflags to link libxbps.so

Ref: https://github.com/void-linux/void-packages/pull/22644

srcpkgs/xbps/patches/cflags.patch

@@ -0,0 +1,17 @@
+Both CFLAGS and LDFLAGS need to be passed during linkage as CFLAGS may contain
+things that influence linkage (e.g. ssp_nonshared may be necessary to link
+when using strong stack protector)
+
+diff --git lib/Makefile lib/Makefile
+index 65342ef..847bfdd 100644
+--- lib/Makefile
++++ lib/Makefile
+@@ -78,7 +78,7 @@ $(OBJS): %.o: %.c
+ 
+ libxbps.so: $(LIBFETCH_OBJS) $(LIBPROP_OBJS) $(OBJS)
+ 	@printf " [CCLD]\t\t$@\n"
+-	${SILENT}$(CC) $^ $(LDFLAGS) -o $(LIBXBPS_SHLIB)
++	${SILENT}$(CC) $^ $(CFLAGS) $(LDFLAGS) -o $(LIBXBPS_SHLIB)
+ 	@-ln -sf $(LIBXBPS_SHLIB) libxbps.so.$(LIBXBPS_MAJOR)
+ 	@-ln -sf $(LIBXBPS_SHLIB) libxbps.so
+