Implement the NO_INSTALL feature. Setting this variable to any value in

Implement the NO_INSTALL feature. Setting this variable to any value in
a directory's Makefile will prevent the build products from that directory
from being installed. This is useful for tools and libraries that are
only useful as part of the build process.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33968 91177308-0d34-0410-b5e6-96231b3b80d8