re: introduce OBJMACHINE_ARCH

[matthew green <mrg%eterna.com.au@localhost>]

> I would like to keep multiple object directories like obj.evbarm-armeh and
> evbarm-earmeh etc. Unfortunately this is difficult to do now. Here's a patch
> that cleans up the existing code and add this feature:

i don't think we need to patch make.  i use this:

setenv  MAKEOBJDIRPREFIX        '/var/obj/${MACHINE}${MACHINE_ARCH:N${MACHINE}:C/(.)/-\1/}${ACTIVE_CC:Mclang}

which gives me that feature without any source code changes and
it works going back to when MAKEOBJDIRPREFIX was added.


.mrg.