Fix script now that some packages can be missing.

diff --git a/show-build-order.pl b/show-build-order.pl
index ffa8491..9f0de27 100755 (executable)
--- a/show-build-order.pl
+++ b/show-build-order.pl
@@ -92,7 +92,7 @@ sub main {
 
     while (<PACKAGES>) {
        chomp;
-       if (/^mingw32-(.*)/) {
+       if (/^mingw32-(.*)/ && exists $br{$_}) {
            $packagename = $_;
            my $dirname = $1;