[tlbuild] trial builds for TL'13

[Nelson H. F. Beebe]

>> The following fails to work on Solaris which is why the build fails:
>>
>>     gmake -v 2>/dev/null | grep '\(GNU\|makepp\)'

Why is a nonstandard pattern being used?  Normally, this would be
written

	gmake -v 2>/dev/null | egrep 'GNU|makepp'

and that should work everywhere.

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