DEPS.xwalk: Roll ozone-wayland (f4faec5 -> 55f39c6).

55f39c6 wayland.gyp: Use pkg-config-wrapper from the right location.

BUG=https://crosswalk-project.org/jira/browse/XWALK-1673
Merge pull request #1939 from rakuco/oz-wl-roll

DEPS.xwalk: Roll ozone-wayland (f4faec5 -> 55f39c6).