Fix #76: always use llvm-config.h, not config.h
Fix #76: always use llvm-config.h, not config.h

ssarangi/llvmlite,pitrou/llvmlite,numba/llvmlite,m-labs/llvmlite,m-labs/llvmlite,numba/llvmlite,numba/llvmlite,pitrou/llvmlite,markdewing/llvmlite,numba/llvmlite,m-labs/llvmlite,pitrou/llvmlite,m-labs/llvmlite,markdewing/llvmlite,markdewing/llvmlite,pitrou/llvmlite,ssarangi/llvmlite,markdewing/llvmlite,ssarangi/llvmlite,ssarangi/llvmlite