Add .pyc files to .gitignore to compiler-rt

During testing .pyc temporary files appear, which may be annoying.
Did not change SVN ignore, as it was heavily out of sync with GIT one.

Differential Revision: D35815

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@308931 91177308-0d34-0410-b5e6-96231b3b80d8

Author: George Karpenkov

.gitignore

@@ -3,3 +3,4 @@ darwin_fat
 clang_darwin
 multi_arch
 *.sw?
+*.pyc