Libraries without '-l' treated as relative paths.

Libraries without '-l' treated as relative paths.

The following have the same effect on Windows:
'msvs_settings': { 'VCLinkerTool': { 'AdditionalDependencies': [ 'windowscodecs.lib', ],},},
'link_settings': {'libraries': ['-lwindowscodecs.lib',],},

But this one is different:
'link_settings': {'libraries': ['windowscodecs.lib',],},

since this last one will attempt to find the library at
third_party\skia\gyp\windowscodecs.lib
or a place like this, instead of looking in the library paths.

This also fixes capitalization of the affected libraries.

R=bsalomon@google.com

Review URL: https://codereview.chromium.org/99463002

git-svn-id: http://skia.googlecode.com/svn/trunk@12434 2bbb7eff-a529-9590-31e7-b0007b416f81