Merge "Properly detect if CACHE_ACCEL is available in the installer"

diff --combined includes/installer/LocalSettingsGenerator.php
index 7df1009,38019e4..a9710eb
--- 1/includes/installer/LocalSettingsGenerator.php
--- 2/includes/installer/LocalSettingsGenerator.php
+++ b/includes/installer/LocalSettingsGenerator.php
@@@ -69,7 -69,7 +69,7 @@@ class LocalSettingsGenerator 
                        $db->getGlobalNames()
                );
  
-               $unescaped = [ 'wgRightsIcon', 'wgLogo' ];
+               $unescaped = [ 'wgRightsIcon', 'wgLogo', '_Caches' ];
                $boolItems = [
                        'wgEnableEmail', 'wgEnableUserEmail', 'wgEnotifUserTalk',
                        'wgEnotifWatchlist', 'wgEmailAuthentication', 'wgEnableUploads', 'wgUseInstantCommons',
@@@ -241,7 -241,7 +241,7 @@@
                }
  
                if ( !$this->values['wgShellLocale'] ) {
 -                      $this->values['wgShellLocale'] = 'en_US.UTF-8';
 +                      $this->values['wgShellLocale'] = 'C.UTF-8';
                        $locale = '#';
                } else {
                        $locale = '';