package/gettext-tiny: take GNU gettext from our own directory
Even though gettext-tiny re-uses the gettext-gnu source code, it makes
a separate download in the gettext-tiny download folder, so use this
one, and not the one from the gettext-gnu download folder, which may
not exist.
Fixes:
http://autobuild.buildroot.net/results/4e289f30bc6e58ad81611e8e04779134dcbe1241/
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>