Patch Perl-Sys-Mmap to fix CPAN bug 91483

Recently, an issue in the open source project, ZoneMinder, was traced back to the perl mmap module. 

This request proposes to patch perl-Sys-Mmap with the patch file supplied in the following bug report:
https://rt.cpan.org/Public/Bug/Display.html?id=91483

Note that I can easily update this pull request to bump the version of mmap from 0.14 to the latest 0.16 if requested. Please advise.