remove non-portable sed invocation as brson says we no longer have clang in tree.

pnkfelix · pnkfelix · commit a1cd1429fb6f · 2013-07-18T02:33:11.000+02:00
diff --git a/configure b/configure
@@ -921,9 +921,6 @@ do
         esac
         need_ok "LLVM configure failed"
 
-        # Hack the tools Makefile to turn off the clang build
-        sed -i 's/clang//g' tools/Makefile
-
         cd $CFG_BUILD_DIR
     fi
 
