[Bug 246919] misc/mime-support: run-mailcap TempFile infinite loop

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=246919

            Bug ID: 246919
           Summary: misc/mime-support: run-mailcap TempFile infinite loop
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: oliver at FreeBSD.org
          Reporter: p-fbsd-bugs at ziemba.us
             Flags: maintainer-feedback?(oliver at FreeBSD.org)
          Assignee: oliver at FreeBSD.org

Created attachment 215143
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=215143&action=edit
patch for port misc/mime-support to improve tempfile name generation

When run-mailcap is called with a filename containing shell metacharacters, it
attempts to symlink a temporary filename to the original file before calling a
mime-type-specific program to process the file.

The subroutine TempFile, which is supposed to return the temporary filename,
calls the linux-specific program "tempfile". On FreeBSD this call fails
silently, causing TempFile to return an empty string, causing the calling loop
to iterate endlessly.

The attached patch implements two changes:

1. Instead of calling the executable "tempfile", use perl's File::Temp which
should work on all platforms

2. If the calling loop reaches fifty iterations, die

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