bisect.pl should fall back on makedepend.SH from v5.34.0, not blead.

Post v5.34.0, commit 8d469d0 completely changes how makedepend.SH
interacts with Makefile.SH, meaning that it's not a drop-in upgrade.

Author: nwc10

Porting/bisect-runner.pl

@@ -825,7 +825,7 @@ =head1 OPTIONS
 --gold
 
 Revision to use when checking out known-good recent versions of files,
-such as F<makedepend.SH>. F<bisect-runner.pl> defaults this to I<blead>,
+such as F<hints/freebsd.sh>. F<bisect-runner.pl> defaults this to I<blead>,
 but F<bisect.pl> will default it to the most recent stable release.
 
 =item *
@@ -2903,7 +2903,12 @@ sub patch_SH {
     # If you do this, you may need to add in code to correct the output of older
     # makedepends, which don't correctly filter newer gcc output such as
     # <built-in>
-    checkout_file('makedepend.SH');
+
+    # It's the same version in v5.26.0 to v5.34.0
+    # Post v5.34.0, commit 8d469d0ecbd06a99 completely changes how makedepend.SH
+    # interacts with Makefile.SH, meaning that it's not a drop-in upgrade.
+    checkout_file('makedepend.SH', 'v5.34.0')
+        if $major < 26;
 
     if ($major < 4 && -f 'config.sh'
         && !extract_from_file('config.sh', qr/^trnl=/)) {