gitweb: True fix: Support for the standard mime.types map in gitweb

True fix for error in mimetype_guess, error introduced in original commit
2d00737489b8c61ed616b261c7c9bd314e2b0b41 and later fixed temporarily
by commenting out the line that caused error in commit
57bd4d3523efecf60197040cad34154aff4ddf80.

Gitweb now supports mime.types map $mimetypes_file relative to project.

Signed-off-by: Jakub Narebski <jnareb@gmail.com>
Signed-off-by: Junio C Hamano <junkio@cox.net>
diff --git a/gitweb/gitweb.perl b/gitweb/gitweb.perl
index 52ae2aa..15875a8 100755
--- a/gitweb/gitweb.perl
+++ b/gitweb/gitweb.perl
@@ -880,7 +880,10 @@
 
 	if ($mimetypes_file) {
 		my $file = $mimetypes_file;
-		#$file =~ m#^/# or $file = "$projectroot/$path/$file";
+		if ($file !~ m!^/!) { # if it is relative path
+			# it is relative to project
+			$file = "$projectroot/$project/$file";
+		}
 		$mime = mimetype_guess_file($filename, $file);
 	}
 	$mime ||= mimetype_guess_file($filename, '/etc/mime.types');