Do not install {Clang,Cling}Config.cmake in the project lib dir.

This should fix the clad builds and unpollute the ROOTSYS/lib.

Author: vgvassilev

interpreter/cling/cmake/modules/CMakeLists.txt

@@ -2,7 +2,7 @@
 # link against them. LLVM calls its version of this file LLVMExports.cmake, but
 # the usual CMake convention seems to be ${Project}Targets.cmake.
 set(CLING_INSTALL_PACKAGE_DIR lib${LLVM_LIBDIR_SUFFIX}/cmake/cling)
-set(cling_cmake_builddir "${CMAKE_BINARY_DIR}/${CLING_INSTALL_PACKAGE_DIR}")
+set(cling_cmake_builddir "${LLVM_BINARY_DIR}/${CLING_INSTALL_PACKAGE_DIR}")
 
 # Keep this in sync with llvm/cmake/CMakeLists.txt!
 set(LLVM_INSTALL_PACKAGE_DIR lib${LLVM_LIBDIR_SUFFIX}/cmake/llvm)

interpreter/llvm/src/tools/clang/cmake/modules/CMakeLists.txt

@@ -4,7 +4,7 @@ include(LLVMDistributionSupport)
 # link against them. LLVM calls its version of this file LLVMExports.cmake, but
 # the usual CMake convention seems to be ${Project}Targets.cmake.
 set(CLANG_INSTALL_PACKAGE_DIR lib${LLVM_LIBDIR_SUFFIX}/cmake/clang)
-set(clang_cmake_builddir "${CMAKE_BINARY_DIR}/${CLANG_INSTALL_PACKAGE_DIR}")
+set(clang_cmake_builddir "${CLANG_BINARY_DIR}/${CLANG_INSTALL_PACKAGE_DIR}")
 
 # Keep this in sync with llvm/cmake/CMakeLists.txt!
 set(LLVM_INSTALL_PACKAGE_DIR lib${LLVM_LIBDIR_SUFFIX}/cmake/llvm)