Add a script to run spatch with appropriate arguments

It's a bit tricky to remember the right incantation to get the
proper include paths and incantations for coccinelle, but without
it, coccinelle is less effective at parsing our C.

scripts/coccinelle/apply.sh

@@ -0,0 +1,9 @@
+#!/bin/sh
+
+# apply.sh:
+# run spatch with appropriate includes and builtins for the Tor source code
+
+top="$(dirname "$0")/../.."
+
+spatch -macro_file_builtins "$top"/scripts/coccinelle/tor-coccinelle.h \
+       -I "$top" -I "$top"/src -I "$top"/ext "$@"