Makefile: Redirect llvm-config stderr to /dev/null
Makefile: Redirect llvm-config stderr to /dev/null

Signed-off-by: Pekka Enberg <add4fcd06328a394f0ad91feda7ee057316dc5ed@iki.fi>

penberg/hornet,penberg/hornet,penberg/hornet,penberg/hornet