diffutils 2.8.1 ISO C90 compliance patch

[Paul Edwards]

The attached patch contains changes required to make
diffutils 2.8.1 compile and run on a pure ISO C90
environment.  I only tested the text-processing programs
diff and diff3.  Because you can't portably do a pipe, I
added 2 extra positional parameters to diff3 so that you
have to do the individual diffs outside of diff3 and pass
the results in as parameters.  This was the most major
change.

It is working on MVS 3.8, an EBCDIC host.

BFN.  Paul.

diffc90.txt
Description: Text document