maint: update quoting of "Try `prog --help'" to "Try 'prog --help'"

Automatically adjust both the source (now in only one place)
and all tests that expect the resulting output via this:

git grep -l 'Try.*--help' src/system.h tests \
  | xargs perl -pi -e 's/Try \\?`(\S+ --help)/Try '\''$1/'

1 files changed, 1 insertions, 1 deletions

diff --git a/tests/misc/cut b/tests/misc/cut
index 0114d6545..8c3676ef0 100755
--- a/tests/misc/cut
+++ b/tests/misc/cut
@@ -28,7 +28,7 @@ my $mb_locale = $ENV{LOCALE_FR_UTF8};
   and $mb_locale = 'C';
 
 my $prog = 'cut';
-my $try = "Try \`$prog --help' for more information.\n";
+my $try = "Try '$prog --help' for more information.\n";
 my $from_1 = "$prog: fields and positions are numbered from 1\n$try";
 my $inval = "$prog: invalid byte or field list\n$try";
 my $no_endpoint = "$prog: invalid range with no endpoint: -\n$try";