[tlbuild] libiconv issue

[Nelson H. F. Beebe]

>> or even better, configure using '--without-iconv'

I'm happy to have a global option that doesn't require source-code
changes.

I added that option to some additional builds started late yesterday,
but haven't got to examining them to find out whether the option is
correctly propagated to child configure scripts.

Also, there is inconsistency in configure scripts: some want
--disable-FEATURE and others --without-FEATURE, and FEATURE might be
iconv or libiconv or nls.  Also, it is often unclear from --help
output whether FEATURE is enabled or disabled by default; you
only figure that out after seeing what the build actually did.


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