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Some distros (eg. Gentoo) use a non-default libXcursor path, so the
path (which was previously hardcoded) must now be obtained from
libXcursor.  This patch uses dlopen()/dlsym() to get the path when
available.

BUG=1127712
R=sky

Change-Id: Ib99dff0448c521c1a6cf8ad03bfe981572b9627c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2410305
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Auto-Submit: Thomas Anderson <thomasanderson@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#807158}