perl: update to 5.28.0.

Removed some ancient patches. Fix a pkglint warning.

Core Enhancements

    Unicode 10.0 is supported
    delete on key/value hash slices
    Experimentally, there are now alphabetic synonyms for some regular expression assertions
    Mixed Unicode scripts are now detectable
    In-place editing with perl -i is now safer
    Initialisation of aggregate state variables
    Full-size inode numbers
    The sprintf %j format size modifier is now available with pre-C99 compilers
    Close-on-exec flag set atomically
    String- and number-specific bitwise ops are no longer experimental
    Locales are now thread-safe on systems that support them
    New read-only predefined variable ${^SAFE_LOCALES}

Security

    [CVE-2017-12837] Heap buffer overflow in regular expression compiler
    [CVE-2017-12883] Buffer over-read in regular expression parser
    [CVE-2017-12814] $ENV{$key} stack buffer overflow on Windows
    Default Hash Function Change

Incompatible Changes

    Subroutine attribute and signature order
    Comma-less variable lists in formats are no longer allowed
    The :locked and :unique attributes have been removed
    \N{} with nothing between the braces is now illegal
    Opening the same symbol as both a file and directory handle is no longer allowed
    Use of bare << to mean <<"" is no longer allowed
    Setting $/ to a reference to a non-positive integer no longer allowed
    Unicode code points with values exceeding IV_MAX are now fatal
    The B::OP::terse method has been removed
    Use of inherited AUTOLOAD for non-methods is no longer allowed
    Use of strings with code points over 0xFF is not allowed for bitwise string operators
    Setting ${^ENCODING} to a defined value is now illegal
    Backslash no longer escapes colon in PATH for the -S switch
    the -DH (DEBUG_H) misfeature has been removed
    Yada-yada is now strictly a statement
    Sort algorithm can no longer be specified
    Over-radix digits in floating point literals
    Return type of unpackstring()

Deprecations

    Use of vec on strings with code points above 0xFF is deprecated
    Some uses of unescaped "{" in regexes are no longer fatal
    Use of unescaped "{" immediately after a "(" in regular expression patterns is deprecated
    Assignment to $[ will be fatal in Perl 5.30
    hostname() won't accept arguments in Perl 5.32
    Module removals

Performance Enhancements

Modules and Pragmata

    Removal of use vars
    Use of DynaLoader changed to XSLoader in many modules
    Updated Modules and Pragmata
    Removed Modules and Pragmata

More details are in the included perldelta.pod.

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