v9999.26

• Reduce the size of handle.t to prevent failures on systems with limits set
• Skip all tests in the suite that relied on overriding syswrite to test
  failure mechanisms as CORE::print cannot be overridden.
• Refactor write_file to use print rather than syswrite.
  • When performing an atomic write, make sure we find a good temporary file
    so that we don't accidentally overwrite a file that may already exist in
    the working directory.
  • Stop re-working the line endings on write_file when on Windows as the use
    of print now allows layers to provide that functionality.
• Add File::Basename, File::Spec, File::Temp, and IO::Handle to the runtime
  prereqs. These were already testing prereqs and are core.
• Perl 5.30 compliance is complete at this point.