Linux: work around broken dlsym's.
Linux: work around broken dlsym's.

It appears that Nvidia's libGL.so is overriding dlopen/dlsym with
versions that don't fully function. So far, all the users reporting
this have been running Gentoo, but it might just be that they have
up-to-date drivers. The report[1] suggests that all drivers >= 180
have this issue.

[1] http://www.nvnews.net/vbulletin/showthread.php?t=132259

BUG=16800
http://codereview.chromium.org/201055


git-svn-id: http://src.chromium.org/svn/trunk/src@25671 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 58cf2745cb8efcdbbfb3a205ecb34f81d16819a2
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser