Bump libclang API minor version after r271351.

Also use the next enum value for CXObjCPropertyAttr_class.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@271747 91177308-0d34-0410-b5e6-96231b3b80d8

 Conflicts:
	include/clang-c/Index.h
1 file changed