Add helper script for future imports.

sys/external/bsd/compiler_rt/prepare-import.sh

@@ -0,0 +1,18 @@
+#!/bin/sh
+# $NetBSD: prepare-import.sh,v 1.1 2013/07/04 22:12:40 joerg Exp $
+#
+# Checkout compiler_rt into dist.
+# Run this script and check for additional files and directories to prune,
+# only relevant content should be included.
+
+set -e
+
+cd dist
+rm -rf .svn
+rm -rf BlocksRuntime SDKs cmake include make www
+rm -f .arcconfig .gitignore CMakeLists.txt Makefile
+rm -rf lib/asan lib/interception lib/msan lib/msandr lib/sanitizer_common
+rm -rf lib/tsan lib/ubsan
+rm -f lib/*/Makefile.mk lib/Makefile.mk lib/CMakeLists.txt
+rm -f lib/apple_versioning.c lib/lit.common.* lib/profile/CMakeLists.txt
+rmdir lib/sparc64