Add libxml2 to linux buildbot and SDK ports bundle.

BUG=None
TEST=make sdklibs

Review URL: https://codereview.chromium.org/12040098

git-svn-id: http://naclports.googlecode.com/svn/trunk/src@690 7dad1e8b-422e-d2af-fbf5-8013b78bd812
Remove old gcc -V workaround

This removes a lot of error chatter from the win32 build.

BUG=None

Review URL: https://codereview.chromium.org/12035109

git-svn-id: http://naclports.googlecode.com/svn/trunk/src@691 7dad1e8b-422e-d2af-fbf5-8013b78bd812
Fix ARM build of naclports.

BUG=https://code.google.com/p/naclports/issues/detail?id=65
TEST=make NACL_ARCH=arm

Review URL: https://codereview.chromium.org/12091027

git-svn-id: http://naclports.googlecode.com/svn/trunk/src@692 7dad1e8b-422e-d2af-fbf5-8013b78bd812