Ensure that we can build with both dunfell (LLVM10) and current master
(LLVM11) of meta-clang. Look for LLVMVERSION set by meta-clang and
include relevant patches based on the version.
There's no official release for SPIRV-LLVM-Translator yet for LLVM11 so
pick the latest.
Signed-off-by: Anuj Mittal <anuj.mittal@intel.com>
