Don't call mcrouter --help at the end of the build script

Summary: mcrouter --help exits with nonzero status code, which causes the whole script to have nonzero code.

Test Plan: verify the script has 0 status on successful build

Reviewed By: pavlo@fb.com

Subscribers: meyering, alikhtarov

FB internal diff: D1561594

Tasks: 5175834

mcrouter/scripts/get_and_build_everything.sh

@@ -21,4 +21,4 @@ for script in $(ls "order_$ORDER/" | egrep '^[0-9]+_.*[^~]$' | sort -n); do
 	"./order_$ORDER/$script" "$PKG_DIR" "$INSTALL_DIR" "$MAKE_ARGS"
 done
 
-"$INSTALL_DIR/bin/mcrouter" --help
+printf "%s\n" "Mcrouter installed in $INSTALL_DIR/bin/mcrouter"