Added JDK 13

Makefile

@@ -110,3 +110,25 @@ build-12:
 	rm -rf jdk12u-jdk-12.0.2+10
 	swapoff swap
 	rm -rf swap
+
+13: 12 build-13
+
+build-13:
+	dd if=/dev/zero of=swap bs=1048576 count=1024
+	chmod 600 swap
+	mkswap swap
+	swapon swap
+	tar xf jdk-13.0.2+8.tar.bz2
+	cd jdk13u-jdk-13.0.2+8 && PATH=/build/usr/bin:$$PATH bash configure --enable-unlimited-crypto --disable-warnings-as-errors --with-stdc++lib=dynamic --with-giflib=system --with-lcms=system --with-libjpeg=system --with-libpng=system --with-zlib=system --with-version-build="13" --with-version-pre="" --with-version-opt=""
+	$(MAKE) -C jdk13u-jdk-13.0.2+8 images PATH=/build/usr/bin:$$PATH
+	mkdir -p /opt/jdk-13.0.2+8
+	cd jdk13u-jdk-13.0.2+8 && cp -Rv build/*/images/jdk/* /opt/jdk-13.0.2+8
+	chown -R root:root /opt/jdk-13.0.2+8
+	find /opt/jdk-13.0.2+8 -name \*.diz -delete
+	ln -sfv -n jdk-13.0.2+8 /opt/jdk
+	rm -f /opt/jdk/lib/security/cacerts
+	ln -svf /etc/ssl/java/cacerts /opt/jdk/lib/security/cacerts
+	rm -rf /opt/jdk-12.0.2+10
+	rm -rf jdk13u-jdk-13.0.2+8
+	swapoff swap
+	rm -rf swap