mac output cleanup script: fix match for "nothing to do" make output

Shoulda written a test!

Review URL: http://codereview.chromium.org/5739006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@69061 0039d316-1c4b-4281-b951-d872f2087c98

build/sanitize-mac-build-log.sed

@@ -11,7 +11,7 @@
 /^Check dependencies/d
 /^    setenv /d
 /^    cd /d
-/^make: nothing to be done/d
+/^make: Nothing to be done/d
 
 # Xcode prints a short "compiling foobar.o" line followed by the lengthy
 # full command line.  These deletions drop the command line.