lint-gitlink: preemptively ignore all /ifn?def|endif/ macros

Instead of testing if the macro name is ifn?def:: as if it were a inline
macro, it is faster and safer to just ignore such block macro lines before
hand.

Signed-off-by: Jean-Noël Avila <jn.avila@free.fr>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: jnavila

Documentation/lint-gitlink.perl

@@ -41,10 +41,11 @@ sub report {
 @ARGV = $to_check;
 while (<>) {
 	my $line = $_;
+	next if $line =~ /^\s*(ifn?def|endif)::/;
 	while ($line =~ m/(.{,8})((git[-a-z]+|scalar)\[(\d)*\])/g) {
 	    my $pos = pos $line;
 	    my ($macro, $target, $page, $section) = ($1, $2, $3, $4);
-		if ( $macro ne "linkgit:" && $macro !~ "ifn?def::" && $macro ne "endif::" ) {
+		if ( $macro ne "linkgit:" ) {
 			report($pos, $line, $target, "linkgit: macro expected");
 		}
 	}