Exclude .svn (and other "dot" directories) when installing headers.
Exclude .svn (and other "dot" directories) when installing headers.

My fix for PR15820 in r180132 inadvertently removed the exclusion for ".*".
This puts it back again. Thanks for Nico Weber for pointing this out!

git-svn-id: 756ef344af921d95d562d9e9f9389127a89a6314@203807 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/libcxx,llvm-mirror/libcxx,llvm-mirror/libcxx,llvm-mirror/libcxx,llvm-mirror/libcxx