Initial checkin of Pika from heckimp

build/windows/jhbuild/clean

@@ -0,0 +1,18 @@
+#!/bin/bash
+
+pushd checkout
+rm -rf *-*/
+find . -maxdepth 1 -type f -atime +25 -print -delete
+
+for gitdir in babl gegl pika; do
+	pushd $gitdir
+	git clean -xdf
+	popd
+done
+
+popd
+
+if [[ "$1" != "--skip-targets" ]]; then
+	echo "Cleaning targets"
+	rm -rf targets/*
+fi