HEADS UP: arm ports now building EABI by default

[Jeff Rizzo]

As discussed here over the last few weeks, I have just switched the 
default builds for most ARM ports to their EABI variants ("earm" 
MACHINE_ARCH).  The old ABI can be built, if desired, by either 
explicitly supplying "arm" instead of "earm" as the MACHINE_ARCH to 
build.sh using the -a flag, or by building the appropriate OABI target 
alias (hpcoarm, oshark, ocats, evboarm-el, etc).

The builds on releng.n.o for 03 August 2014 (UTC) and later will reflect 
these changes.

+j