Add csu objects to shared libraries on OpenBSD.

This is required by recent changes to the stack protector code in gcc,
generating references to __guard_local instead of __guard, defined in
crtbeginS.o.

This is a temporary solution; strictly speaking, we shouldn't invoke ld
directly at all but use cc instead.

cde/config/cf/OpenBSD.cf

@@ -1028,5 +1028,7 @@ install:: fonts.alias							@@\
 #define KornShell               /usr/local/bin/ksh93
 #endif
 
+#define SharedLibraryLoadFlags	-shared /usr/lib/crtbeginS.o /usr/lib/crtendS.o
+
 /* This must come last */
 #include <bsdLib.rules>