Log Message:
Update to 1.66:

1.66
     - bump requirements to libxslt 1.1.8
     - sync the binary internals to those of XML::LibXML 1.66

1.63
     - fix SIGSEGV regarding freeing nodes created by extension functions
       (reported by Elizabeth Mattijsen)
     - use pkg-config to determine linker flags for libexslt

1.62
     - security callback interface contributed by Shane Corgatelli
     - check libxslt version
     - added XML::LibXML-like API to retrieve libxslt version
     - added output_as_bytes() and output_as_chars()
     - added regression tests for output_as_* to 11utf8.t
     - output_as_string documentation fixed to match reality
     - make 06entities.t to pass with older libxml2/libxslt
     - POD uses items instead of headings
     - fixed media_type and output_encoding for imported stylesheets \ 
[rt.cpan.org #23440]

1.61
     - fixed error reporting: die on fatal errors, warn otherwise
       (in particular, warn rather than die on <xsl:message \ 
terminate="no">)