community/openjdk8: ensure that pkgver matches source version

community/openjdk8/APKBUILD

@@ -81,6 +81,11 @@ unpack() {
 prepare() {
 	cd "$builddir"
 
+	local ver_u=$(sed -En 's/^JDK_UPDATE_VERSION\s*=\s*(\S+).*/\1/p' Makefile.am)
+	local ver_b=$(sed -En 's/^BUILD_VERSION\s*=\s*b(\S+).*/\1/p' Makefile.am)
+	[ "${pkgver#*.}" = "$ver_u.$ver_b" ] \
+		|| die "Version mismatch, source is 8.$ver_u.$ver_b, but abuild defines $pkgver!"
+
 	# Busybox sha256 does not support longopts.
 	sed -e "s/--check/-c/g" -i Makefile.am