Log Message:
Update p5-Module-ScanDeps to 1.20:

1.20  2015-10-04

- Fix RT #107304: Newer versions of File::Path cause warning "_Inline for \ 
_Inline: No such file or directory at Module/ScanDeps.pm line 1339."
  - drop the dubious call to rmtree()

- Fix RT106142: Preload dependencies for PDL and PDL::NiceSlice
  - adopted from a patch by Shawn Laffan, thanks Shawn!

- Fix RT#106144: Preload dependencies for File::BOM)
  - adopted from a patch by Shawn Laffan, thanks Shawn!

- Revise our stance on utf8.pm:

  - A line of "use utf8;" just means "this file is encoded in \ 
UTF-8"
    and should _not_ result in scanning utf8.pm which will pull in
    the whole Unicode shebang (propery tables and what not).
    Yes, utf8.pm _doesn contain "require utf8_heavy.pl", but only inside
    an AUTOLOAD() that is _not_ triggered by calling functions
    like utf8::is_utf8().

  - OTOH the innocently looking one-liner

      perl -ne 'print if /\pN/'

    implicitly loads utf8.pm and triggers the AUTOLAD().

  - So prevent utf8.pm from being scanned and make utf8_heavy.pl
    the indicator for "I need the Unicode stuff" instead.

  - Cache the results of _get_preload('utf8_heavy.pl').

- Make %Preload "transitive" so that given

    my %Preload = (
      'Foo.pm' => [ 'Bar.pm' ],
      'Bar.pm' => [ 'Quux.pm' ],
      ...
    );

  scan_deps_static() register a dependency on Bar.pm _and_
  Quux.pm when it saw "use Foo;"

- Minor changes:
  - drop dubious %Preload of utf8.pm for SOAP::Lite and XML::Parser::Expat
  - drop code for Perl < 5.008 as we require 5.8.1 already
  - rework the implementation of -x/-c
  - add add_preload_rule() to dynamically add a %Preload rule
  - recognize constructs like "open FH, '<:via(Foo)', ..."
  - upgrade to Module::Install 1.16