This generates incorrect -lX11 with use_x11=0 in our other build system,
which causes the standalone libjingle_media target to not build.
This patch should fix that. I could remove -lX11 completely, and
libjingle still links fine. So does Chrome if I do the corresponding
change there, so I think this change is safe to make.
BUG=None
Review URL: https://codereview.webrtc.org/1306243013
Cr-Commit-Position: refs/heads/master@{#9869}