cPanel review of v0.33

[drmuey]

Using git hub to track since I need to upload before this is complete.

All major stakeholders aside from cPanel has signed off on this feature and implementation.

So we need to review it from cPanel’s point of view and adjust if necessary.

Change:

1. dc1d043
2. Create rt 101721 for L::M::U followup

Testing:

1. All 699366 tests pass (including the new tests for this feature and RELEASE_TESTING)
2. Locale::Maketext used to 'use if' so it was ok for perlcc via 5.6.
3. 'use if' works with perlcc **
4. will not effect cPanel behavior at this time because it uses the default behavior and because an internal version is used

**

Basic 'use if' compile test:

# cat tmp/useif.pl
use if $ENV{UNI}, "utf8";

print length("I ☃") . "\n";
# perl tmp/useif.pl
5
# UNI=1 perl tmp/useif.pl
3
#  perlcc tmp/useif.pl -o tmp/useif
# tmp/useif
5
# UNI=1 perlcc tmp/useif.pl -o tmp/useif
3
# 

lazy load at runtime that does use if technique this change does:

# cat uif.pl 
use You;
print You::pl() . "\n";
# cat You.pm 
package You;

use strict;
use warnings;
our $VAR = 0;
sub import {
   $VAR = 1;
}

sub pl { 
     require You::Too;
     return You::Too::me();
}
1;
# cat You/Too.pm 
package You::Too;

use strict;
use warnings;
use if $You::VAR, 'utf8';

sub me {
    return length("español"); # 8 bytes for 7 character
}

1;
# perlcc uif.pl
# ./uif 
7
#

change it to have the var be false and the result is 8