Add BGRA output format support to qcms

Add BGRA output format support to qcms 

Define QCMS_OUTPUT_BGRX and add qcms_transform_data_type() api to output 
BGR or BGRA format for GRAY, GRAYA, RGB, and RGBA input data. 

Update all color transform functions with an output format argument, use 
that to select RGBX (the default) or BGRX output format. 

Add google.patch: patch of the BGRA output changes against upstream qcms 
and add README.chromium details about google.patch. TODO: send the patch 
to qcms if accepted for review upstream. 

Disable Visual Studio warnings when needed. 

BUG=143
TEST=None 
AUTHOR=noel@chromium.org
original review = http://codereview.chromium.org/10387099/

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=138414