mac: Let remoting_host_prefpane link with libc++.

Once I figured out the static library libc++ build story, I'll likely move
this target back to libstdc++, but for now it works with libc++, so use the
libc++ in component build like every other target does.

See comment 7 on the linked bug for why the file in overrides/ is needed.

BUG=544531

Review URL: https://codereview.chromium.org/1411553005

Cr-Original-Commit-Position: refs/heads/master@{#354824}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: bed1d0c35e86bc859f94573b4c15d18c17994383
1 file changed