#152926 by dww: add hook_system_info_alter() to make .info file data modifiable in PHP code

includes/module.inc

@@ -123,6 +123,10 @@ function module_rebuild_cache() {
     // Merge in defaults and save.
     $files[$filename]->info = $file->info + $defaults;
 
+    // Invoke hook_system_info_alter() to give installed modules a chance to
+    // modify the data in the .info files if necessary.
+    drupal_alter('system_info', $files[$filename]->info, $files[$filename]);
+
     // Log the critical hooks implemented by this module.
     $bootstrap = 0;
     foreach (bootstrap_hooks() as $hook) {

modules/system/system.module

@@ -1091,6 +1091,11 @@ function system_theme_data() {
   // Read info files for each theme
   foreach ($themes as $key => $theme) {
     $themes[$key]->info = drupal_parse_info_file($theme->filename) + $defaults;
+
+    // Invoke hook_system_info_alter() to give installed modules a chance to
+    // modify the data in the .info files if necessary.
+    drupal_alter('system_info', $themes[$key]->info, $themes[$key]);
+
     if (!empty($themes[$key]->info['base theme'])) {
       $sub_themes[] = $key;
     }