ruby: fix gcc7 build for i686*

With gcc-7.1.0 -fstack-protector or -fstack-protector-strong fail to
link because of undefined references to __stack_chk_fail_local.
This patch is merely a hack to make ruby build until the root cause
for this bug is found.

srcpkgs/ruby/template

@@ -28,6 +28,16 @@ pre_build() {
 	sed -e 's,\(checking_for("wide getaddrinfo") {try_\)run,\1link,' -i ext/socket/extconf.rb
 	# Hack for cross-builds.
 	touch ext/ripper/check
+	if [ "$XBPS_GCC_VERSION_MAJOR" -ge 7 ]; then
+		# Set -fno-stack-protector for i686* or otherwise linking fails with
+		# ...: undefined reference to `__stack_chk_fail_local'
+		case "$XBPS_TARGET_MACHINE" in
+			i686*) sed -i Makefile \
+					-e "s;-fstack-protector-strong;;" \
+					-e "s;-fstack-protector;-fno-stack-protector;"
+				;;
+		esac
+	fi
 }
 post_install() {
 	# Remove references to the cross compiler