ylwrap should be included for any Yacc compilations. (was Re: CVS 1-11-x-branch testing results (SUN Solaris))

[Derek Price]

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ylwrap appears to take care of the problem that Yacc compilers like to
generate #line directives in generated C sources with complete paths
to source files.  Aparrently, this is needed on some systems because
the C compilers there will add paths in #line directives to their
include path as if they had been specified via -I.  When the #line
directive contains a path that happens to exist but contains
incompatible files, this can be a problem.

Original report is archived here:
<https://ccvs.cvshome.org/servlets/ReadMsg?list=test-results&msgNo=13166>.

Anyhow, my suggested fix is to include ylwrap when even a single Yacc
source is found, rather than only for multiple files as happens with
1.9.5.

Cheers,

Derek
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