Update perl5 from version 5.8.8nb8 to 5.10.0.

A large number of packages have had their internal regression tests
run successfully with this update, including mod_perl for Apache.

Pkgsrc changes: a number of our local patches are no longer needed.

Upstream changes from version 5.8.8:

  # Core Enhancements

    * The feature pragma
    * New -E command-line switch
    * Defined-or operator
    * Switch and Smart Match operator
    * Regular expressions
    * say()
    * Lexical $_
    * The _ prototype
    * UNITCHECK blocks
    * New Pragma, mro
    * readdir() may return a "short filename" on Windows
    * readpipe() is now overridable
    * Default argument for readline()
    * state() variables
    * Stacked filetest operators
    * UNIVERSAL::DOES()
    * Formats
    * Byte-order modifiers for pack() and unpack()
    * no VERSION
    * chdir, chmod and chown on filehandles
    * OS groups
    * Recursive sort subs
    * Exceptions in constant folding
    * Source filters in @INC
    * New internal variables
    * Miscellaneous
    * UCD 5.0.0
    * MAD
    * kill() on Windows

  # Incompatible Changes

    * Packing and UTF-8 strings
    * Byte/character count feature in unpack()
    * The $* and $# variables have been removed
    * substr() lvalues are no longer fixed-length
    * Parsing of -f _
    * :unique
    * Effect of pragmas in eval
    * chdir FOO
    * Handling of .pmc files
    * $^V is now a version object instead of a v-string
    * @- and @+ in patterns
    * $AUTOLOAD can now be tainted
    * Tainting and printf
    * undef and signal handlers
    * strictures and dereferencing in defined()
    * (?p{}) has been removed
    * Pseudo-hashes have been removed
    * Removal of the bytecode compiler and of perlcc
    * Removal of the JPL
    * Recursive inheritance detected earlier

  # Modules and Pragmata

    * Upgrading individual core modules
    * Pragmata Changes
    * New modules
    * Selected Changes to Core Modules

  # Utility Changes
  # New Documentation
  # Performance Enhancements

    * In-place sorting
    * Lexical array access
    * XS-assisted SWASHGET
    * Constant subroutines
    * PERL_DONT_CREATE_GVSV
    * Weak references are cheaper
    * sort() enhancements
    * Memory optimisations
    * UTF-8 cache optimisation
    * Sloppy stat on Windows
    * Regular expressions optimisations

  # Installation and Configuration Improvements

    * Configuration improvements
    * Compilation improvements
    * Installation improvements
    * New Or Improved Platforms

  # Selected Bug Fixes
  # New or Changed Diagnostics
  # Changed Internals

    * Reordering of SVt_* constants
    * Elimination of SVt_PVBM
    * New type SVt_BIND
    * Removal of CPP symbols
    * Less space is used by ops
    * New parser
    * Use of const
    * Mathoms
    * AvFLAGS has been removed
    * av_* changes
    * $^H and %^H
    * B:: modules inheritance changed
    * Anonymous hash and array constructors

  ...

See 'perldoc perldelta' or http://perldoc.perl.org/perldelta.html
for explanation of each of these points.

(he)