Enable installation of libc++experimental by default.

When libc++experimental was originally created it was empty and therefore there
was no reason to install it. Now that the library contains
<experimental/memory_resource> and <experimental/filesystem> there is a good
reason to install it.

Specifically this patch enables the installation whenever LIBCXX_INSTALL_LIBRARY
is true and LIBCPP_ENABLE_EXPERIMENTAL_LIBRARY is true.


git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@280773 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed