Revert 65580 - Fix pkg-config-wrapper to work with chromiumos chroots
Revert 65580 - Fix pkg-config-wrapper to work with chromiumos chroots

Some pkg-config packages in chromium os (e.g. gtk) end up hard-coding libdir to be absolute (rather than relative to prefix), so it breaks builds from outside the chroot.
This works around it.

BUG=none
TEST=build with sysroot=/path/to/chromiumos/chroot/build/x86-generic

Review URL: http://codereview.chromium.org/4516002

TBR=piman@chromium.org
Review URL: http://codereview.chromium.org/4754002

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@65585 0039d316-1c4b-4281-b951-d872f2087c98

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