[tlbuild] ptexenc patch

[Ken Brown]

I'm working with one of the Cygwin developers to package TeX Live for 
the Cygwin distribution.  So I'm using the configure options 
--enable-shared and --disable-native-texlive-build.

In this setting the build in ptexenc fails because of undefined symbols 
that should be found in the kpathsea library.  The attached patch fixes 
the problem.  As usual, I don't know whether this is the right way to 
fix it.

Ken
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