Log Message:
Updating textproc/p5-XML-LibXSLT from 1.68 to 1.70

pkgsrc changes:
  - Adding license definition
  - Adjusting dependencies

Upstream changes:
1.70
     - fixed various bugs
     - documentation updates
     - #48247: Win32 patch kindly provided by KMX@cpan.org
     - sync with latest XML::LibXML ABI and add a compatibility check
     - do not force -lgcrypt and -lgpg-error linker flags
     - fix for attribute nodes returned by user-defined XPath functions
     - address #41542: restore internalDTD subset on the source
       document of a transformation (libxslt unlinks it)