Fix Polly build with freshly checked-out source

./build-llvm.sh --with-polly may fail because Makefile.in, aclocal.m4,
and configure in llvm-3.1/polly/utils/cloog_src are regenerated at build.
They were generated by running "./checkout_cloog.sh cloog_src" before
merged, but sadly git doesn't preserve the timestamp at check-out.

Fix it by touching them after download

Change-Id: I9d12663a9236962b5c5a59faff9caf4cde5ba000
1 file changed