Log Message:
Update textproc/libxslt to 1.1.11.

Changes:

   - bug fixes: xsl:include problems (William Brack), UTF8 number pattern
    (William), date-time validation (William), namespace fix (William),
    various Exslt date fixes (William), error callback fixes, leak with
    namespaced global variable, attempt to fix a weird problem #153137
   - improvements: exslt:date-sum tests (Derek Poon)
   - documentation: second tutorial by Panagiotis Lourida