[ClangConfig] Copy ClangConfig.cmake to...

[ClangConfig] Copy ClangConfig.cmake to ${CMAKE_BINARY_DIR}/${CLANG_INSTALL_PACKAGE_DIR} instead of to ${CLANG_BINARY_DIR}/${CLANG_INSTALL_PACKAGE_DIR}.

This is an obvious bug since ClangConfig.cmake looks for ClangTargets.cmake in
${CMAKE_CURRENT_LIST_DIR}. But ClangTargets.cmake is in
${CMAKE_BINARY_DIR}/${CLANG_INSTALL_PACKAGE_DIR}, so it will always fail with an
in tree build.

In the case where clang is built out of tree, this is still correct since
CMAKE_BINARY_DIR and CLANG_BINARY_DIR will be the same.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@274168 91177308-0d34-0410-b5e6-96231b3b80d8

cmake/modules/CMakeLists.txt

@@ -18,5 +18,5 @@ install(FILES
 # can build against a build directory of Clang more easily.
 configure_file(
   ${CMAKE_CURRENT_SOURCE_DIR}/ClangConfig.cmake
-  ${CLANG_BINARY_DIR}/${CLANG_INSTALL_PACKAGE_DIR}/ClangConfig.cmake
+  ${clang_cmake_builddir}/ClangConfig.cmake
   COPYONLY)