Log Message:
Add hack for build failure with native X11 on NetBSD 7.x and -current,
the symptom being that ftttdrv.h (from freetype2) is not found. It
turns out that native X11 doesn't install ftttdrv.h for some reason
(probably an oversight) but that the lack is easily compensated
because the whole file contains only two substantive lines, neither of
which appears to be especially important.

PR 50902.