handle platforms with broken tools in the base system, such as sed

and awk. as proposed on tech-pkg@, with some changes to set the
appropriate tool variables and handle OSs which provide GNU tools
in the base system (ie. do nothing).

this allows packages or users to force the use of pkgsrc GNU tools
when they are not present in the base system by defining e.g.
USE_GNU_TOOLS="awk sed".

Solaris' sed is marked as incompatible, as even the XPG4 sed is too
limited for a number of packages (especially large ones which use
libtool, as libtool calls blind 'sed'), so GNU sed is always used
on Solaris.

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