Fix Clang install rules to not set permissions on include/
The CMake install(DIRECTORY) command documents that it sets permissions
on directories it is asked to install. Since the <prefix>/include
directory may not be exclusive to the LLVM/Clang installation, we should
not ask CMake to manage permissions of that directory for us. Instead,
give only our own include/clang and include/clang-c subdirectories to
the install(DIRECTORY) command.
Fixes PR4500. Patch by Brad King.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@201076
91177308-0d34-0410-b5e6-
96231b3b80d8