[patch #8507] bugs in ax_perl_module_version.m4

[Thomas Klausner]

Follow-up Comment #2, patch #8507 (project autoconf-archive):

I think you're right.
A one-line shell script fails with an arith error.

Why not use
check_args=$(($args_num % 2))

instead? I think that's more portable (but I might of course be wrong).

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