In bisect-runner.pl, make the code to report patching errors more robust.

Previously it was relying on matching an optional part of the patch to get
the name of the file. Now it matches a mandatory part of the patch to get it.

diff --git a/Porting/bisect-runner.pl b/Porting/bisect-runner.pl
index 92e6e2d..44a321b 100755 (executable)
--- a/Porting/bisect-runner.pl
+++ b/Porting/bisect-runner.pl
@@ -449,7 +449,7 @@ sub edit_file {
 sub apply_patch {
     my $patch = shift;
 
-    my ($file) = $patch =~ qr!^diff.*a/(\S+) b/\1!;
+    my ($file) = $patch =~ qr!^--- a/(\S+)\n\+\+\+ b/\1!sm;
     open my $fh, '|-', 'patch', '-p1' or die "Can't run patch: $!";
     print $fh $patch;
     return if close $fh;