[libclc] Create LIBCLC_OUTPUT_LIBRARY_DIR directory before build (#158171)

This fixes `No such file or directory` error when "Unix Makefiles"
generator is used, see intel/llvm#20058.

Ninja generator implicitly creates output directory when generating
libclc libraries, but "Unix Makefiles" generator does not.

Author: wenju-he

libclc/CMakeLists.txt

@@ -104,6 +104,7 @@ else()
 
   # Note we do not adhere to LLVM_ENABLE_PER_TARGET_RUNTIME_DIR.
   set( LIBCLC_OUTPUT_LIBRARY_DIR ${LIBCLC_OUTPUT_DIR}/lib/libclc )
+  file( MAKE_DIRECTORY ${LIBCLC_OUTPUT_LIBRARY_DIR} )
 endif()
 
 if( EXISTS ${LIBCLC_CUSTOM_LLVM_TOOLS_BINARY_DIR} )