openjdk: Add some packaging treats

Add to the package:
* bin/java-config: When invoked with option -H it prints the java home
  directory.
* data/profile.d/openjdk.sh: It is automatically sourced by
  /etc/profile and sets JAVA_HOME.

dev-lang/openjdk/sources/java-config.in

@@ -0,0 +1,37 @@
+#!/bin/sh
+
+
+javaHome="%JAVA_HOME%"
+
+
+printUsage()
+{
+	cat <<EOF
+Usage: java-config <option>
+Print java configuration values.
+
+Options:
+  -h, --help  - Print this help text.
+  -H          - Print Java home path.
+EOF
+}
+
+
+if [ $# -ne 1 ]; then
+	printUsage >&2
+	exit 1
+fi
+
+case "$1" in
+	-H)
+		echo $javaHome
+		;;
+	-h|--help)
+		printUsage
+		exit 0
+		;;
+	*)
+		printUsage >&2
+		exit 1
+		;;
+esac