Add freetype to skia_base_libs when building for NaCl

External users need access to libfreetype.a when they use skia_base_libs.
Review URL: https://codereview.chromium.org/12383022

git-svn-id: http://skia.googlecode.com/svn/trunk/gyp@7934 2bbb7eff-a529-9590-31e7-b0007b416f81
1 file changed