Fix mythwelcome in FE-only builds, add ccache for speedup.

A non-backend build was not building mythwelcome, so when this script
tried to package MythWelcome.app, it barfed. I usually --enable-backend,
so didn't notice the fault. This has been broken for ages.
A slightly different fix to Stuart's [e4c981f].

OSX/build/osx-packager.pl

@@ -61,6 +61,7 @@
 our %depend_order = (
   'mythtv'
   =>  [
+        'ccache',
         'dvdcss',
         'freetype',
         'lame',
@@ -265,6 +266,11 @@
     'url'  => 'http://www.tortall.net/projects/yasm/releases/yasm-1.1.0.tar.gz',
   },
 
+  'ccache' =>
+  {
+    'url'  => 'http://samba.org/ftp/ccache/ccache-3.1.4.tar.bz2',
+  },
+
 );
 
 
@@ -997,7 +1003,8 @@ END
     if ( $comp eq 'mythtv' )
     {
         # Remove/add Nigel's frontend building speedup hack
-        &DoSpeedupHacks('programs/programs.pro', 'mythfrontend mythavtest');
+        &DoSpeedupHacks('programs/programs.pro',
+                        'mythfrontend mythavtest mythwelcome');
     }
 
     &Verbose("Making $comp");