Test-suite failures due to missing Finnish files in tarball

[dmacks]

Using the enca-1.21 tarball, I get several test failures, which have as a typical pattern:

FAIL: ./test-guess-short.sh
===========================

enca: Cannot open file `./fi-s.*' in mode rb: No such file or directory
34,36d33
< fi-s.cp1257: CP1257/LF
< fi-s.iso88594: ISO-8859-4
< fi-s.utf8: UTF-8
FAIL test-guess-short.sh (exit status: 1)

There are in fact no fi-s.* files anywhere in the tarball, even though they are in git via 17ea2387b7e5f583d50f0435b25b0fb8d66334ad. Looks like it's a bug in test/Makefile.am, where those newly created files need to get added to TEST_SAMPLES