Fix posix/tst-regex by using a dedicated input-file.
The recent commit
e6855a3bdfe147c52b29b5e7d70a95a8aa22ece0
changed the encoding of ChangeLog.old/ChangeLog.8 from ISO-8859 to UTF-8.
Unfortunately the test posix/tst-regex assumes the former encoding.
Furthermore Francesco Potortì is now written with 'ì' instead of 'i`'
which would lead to two further matches in the first call to test_expr.
This patch just copies the former ChangeLog.8 file to tst-regex.input
and adjusts the test in order to use this new input file.
ChangeLog:
* posix/tst-regex.c (do_test): Use tst-regex.input as input file.
* posix/tst-regex.input: New file.