harfbuzz: fix install of version.h

version.h is listed both in pkginclude_HEADERS (via $HBHEADERS) and
nodist_pkginclude_HEADERS. This double listing is likely cause of
the make install error:
/usr/bin/install: cannot create regular file `.../harfbuzz/0.9.10-r0/image/usr/include/harfbuzz/hb-version.h': File exists
Just remove the nodist_pkginclude_HEADERS entry. We're not creating
the tarball, and listing version.h here wouldn't prevent the other
listing from including it to tarball anyway.

Signed-off-by: Marko Lindqvist <cazfi74@gmail.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>