Add CMake option LIBCXX_CONFIGURE_IDE to allow for other IDE's.

CLion needs similar configuration changes as MSVC_IDE and XCODE.


git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@255851 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed