Change default RAMASMDEFINES to mirror AAsmModule
The AAsmModule shared makefile fragment predefines two assembly variables
by default when targeting a softload binary: standalone (set to {TRUE})
and MergedMsgs (set to the path to the merged CmdHelp/Messages file).
It's reasonably common for components to migrate over time from AAsmModule
to CModule; to assist with this process, change the default setting for
RAMASMDEFINES to match.
Once this is merged, the following components could have their Makefiles simplified: Debugger, MakePSFont, NVidia and VFPSupport.