Add -Wc,-fstack-protector to LT_LDFLAGS instead of adding

-fstack-protector to LDFLAGS so it doesn't get stripped out.  Libtool
will strip -fstack-protector from the linker flags and we always
link with libtool.

configure

@@ -20413,7 +20413,7 @@ $as_echo "$ax_cv_check_ldflags___fstack_protector" >&6; }
 if test x"$ax_cv_check_ldflags___fstack_protector" = xyes; then :
 
 	    CFLAGS="${CFLAGS} -fstack-protector"
-	    LDFLAGS="${LDFLAGS} -fstack-protector"
+	    LT_LDFLAGS="${LT_LDFLAGS} -Wc,-fstack-protector"
 
 else
   :

configure.in

@@ -3280,7 +3280,7 @@ if test "$enable_hardening" != "no"; then
     AX_CHECK_COMPILE_FLAG([-fstack-protector], [
 	AX_CHECK_LINK_FLAG([-fstack-protector], [
 	    CFLAGS="${CFLAGS} -fstack-protector"
-	    LDFLAGS="${LDFLAGS} -fstack-protector"
+	    LT_LDFLAGS="${LT_LDFLAGS} -Wc,-fstack-protector"
 	])
     ])
     AX_CHECK_LINK_FLAG([-Wl,-z,relro], [LDFLAGS="${LDFLAGS} -Wl,-z,relro"])