Allow drush_make to keep a working-copy of a project.

drush-make-wc.patch

diff --git a/drush_make.orig/drush_make.download.inc b/drush_make/drush_make.download.inc
index 92c68f9..2bd0bb5 100644
--- a/drush_make.orig/drush_make.download.inc
+++ b/drush_make/drush_make.download.inc
@@ -345,6 +345,7 @@ function drush_make_download_post($name, $download, $download_location) {
 function drush_make_download_git($name, $download, $download_location) {
   $tmp_path = drush_make_tmp();
   $wc = drush_get_option('working-copy');
+  $wc = (!empty($download['working-copy'])) ? $download['working-copy'] : $wc;
 
   // check if branch option is set in info file, otherwise set default to master branch
   $download['branch'] = isset($download['branch']) ? $download['branch'] : 'master';
@@ -500,6 +501,10 @@ function drush_make_download_git($name, $download, $download_location) {
 }
 
 function drush_make_download_bzr($name, $download, $download_location) {
+  $wc = drush_get_option('working-copy');
+  // Allow per-project working-copy to be specified in the Makefile.
+  $wc = (!empty($download['working-copy'])) ? $download['working-copy'] : $wc;
+
   $tmp_path = drush_make_tmp();
   $tmp_location = $tmp_path . '/__bzr__/' . basename($download_location);
   drush_make_mkdir(dirname($tmp_location));
@@ -517,7 +522,7 @@ function drush_make_download_bzr($name, $download, $download_location) {
       $args[] = $download['revision'];
     }
     $command .= ' %s %s';
-    if (drush_get_option('working-copy')) {
+    if (!empty($wc)) {
       $args[] = $download['url'];
       $args[] = $tmp_location;
     }
@@ -543,6 +548,10 @@ function drush_make_download_bzr($name, $download, $download_location) {
 
 
 function drush_make_download_svn($name, $download, $download_location) {
+  $wc = drush_get_option('working-copy');
+  // Allow per-project working-copy to be specified in the Makefile.
+  $wc = (!empty($download['working-copy'])) ? $download['working-copy'] : $wc;
+
   if (!empty($download['url'])) {
     if (!empty($download['interactive'])) {
       $function = 'drush_shell_exec_interactive';
@@ -554,7 +563,7 @@ function drush_make_download_svn($name, $download, $download_location) {
     if (!isset($download['force']) || $download['force']) {
       $options = ' --force';
     }
-    if (drush_get_option('working-copy')) {
+    if (!empty($wc)) {
       $command = 'svn' . $options . ' checkout';
     }
     else {