Add clean script.

diff --git a/clean b/clean
new file mode 100755 (executable)
index 0000000..4fe1cff
--- /dev/null
+++ b/clean
@@ -0,0 +1,13 @@
+#!/bin/bash -e
+
+rm -rf binutils-2.23
+rm -rf binutils-build-i686-w64-mingw32
+rm -rf binutils-build-x86_64-w64-mingw32
+rm -rf gcc-4.7.2
+rm -rf gcc-build-i686-w64-mingw32
+rm -rf gcc-build-x86_64-w64-mingw32
+rm -rf mingw-headers-build-i686-w64-mingw32
+rm -rf mingw-headers-build-x86_64-w64-mingw32
+rm -rf mingw-runtime-build-i686-w64-mingw32
+rm -rf mingw-runtime-build-x86_64-w64-mingw32
+rm -rf mingw-w64-v2.0.7