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

True fix for error in mimetype_guess, error introduced in original commit
2d00737489 and later fixed temporarily
by commenting out the line that caused error in commit
57bd4d3523.

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>

gitweb/gitweb.perl

@@ -880,7 +880,10 @@ sub mimetype_guess {
 
 	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');