* added --update option to configure which will re-run the last invocation

(--update must be given as first option, but can be followed by others)
* added simple perl scripts that is used by configure to convert BuildSetup
  from jam to shell format



git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@34896 a95241bf-73f2-0310-859d-f6bbb57e9c96

build/scripts/convert_build_config_to_shell_format.pl

@@ -0,0 +1,21 @@
+#!/usr/bin/perl
+
+use warnings;
+use strict;
+
+=head1 convert_build_config_to_shell_format
+
+This simple script converts its standard input from the jam-specific format
+that is being used in BuildSetup into a format that's understood by sh.
+
+=cut
+
+my $data;
+while (my $line = <>) {
+	$data .= $line;
+	if ($data =~ m{\s*(\w+)\s*\?=\s*\"?([^;]*?)\"?\s*;}gms) {
+		print "$1='$2'\n";
+		$data = '';
+	}
+}
+