package/gettext-tiny: fix licensing

package/gettext-tiny: fix licensing

Fix the license list: it should be a space-separated list of files, it
is not a comma-separated list.

Fixes:
    http://autobuild.buildroot.org/results/74b/74be940e5757d18452b0eb97b9973c278be20345/

Add hashes for the license files while at it, and cleanup the hash file
as well.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Vadim Kochan <vadim4j@gmail.com>
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>