Hide output about SVN::Core not being found during tests.

If the user doesn't have SVN::Core installed or working then the
SVN tests properly turn themselves off.  But the user doesn't need
to know that SVN::Core isn't loadable as a Perl module.  Unless of
course they are trying to debug the test, so lets relegate the Perl
failures to --verbose only.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>

t/lib-git-svn.sh

@@ -26,7 +26,7 @@ use SVN::Core;
 use SVN::Repos;
 \$SVN::Core::VERSION gt '1.1.0' or exit(42);
 system(qw/svnadmin create --fs-type fsfs/, '$svnrepo') == 0 or exit(41);
-"
+" >&3 2>&4
 x=$?
 if test $x -ne 0
 then