t/t91*: do not say how to avoid the tests

Some of the tests "say" how to stop the svn tests from running, some do
not.

The test suite is directed at people reading t/README where we keep all
information about running the test suite (partly, with options etc.).

Remove said "say" occurences.

Signed-off-by: Michael J Gruber <git@drmicha.warpmail.net>
Signed-off-by: Eric Wong <e@80x24.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t9100-git-svn-basic.sh

@@ -8,8 +8,6 @@ GIT_SVN_LC_ALL=${LC_ALL:-$LANG}
 
 . ./lib-git-svn.sh
 
-say 'define NO_SVN_TESTS to skip git svn tests'
-
 case "$GIT_SVN_LC_ALL" in
 *.UTF-8)
 	test_set_prereq UTF8

t/t9158-git-svn-mergeinfo.sh

@@ -7,8 +7,6 @@ test_description='git svn mergeinfo propagation'
 
 . ./lib-git-svn.sh
 
-say 'define NO_SVN_TESTS to skip git svn tests'
-
 test_expect_success 'initialize source svn repo' '
 	svn_cmd mkdir -m x "$svnrepo"/trunk &&
 	svn_cmd co "$svnrepo"/trunk "$SVN_TREE" &&

t/t9160-git-svn-preserve-empty-dirs.sh

@@ -11,7 +11,6 @@ local Git repository with placeholder files.'
 
 . ./lib-git-svn.sh
 
-say 'define NO_SVN_TESTS to skip git svn tests'
 GIT_REPO=git-svn-repo
 
 test_expect_success 'initialize source svn repo containing empty dirs' '