Please describe the problem:
The paramaters (second argument of applyStylesheet) doe not get passed through to the stylesheet on x86_64 platforms.

Steps to reproduce:
With the following code:
#!/usr/bin/env python
import libxml2
import libxslt
import string

styledoc = libxml2.parseDoc("""
<xsl:stylesheet version='1.0'
  xmlns:xsl='http://www.w3.org/1999/XSL/Transform'>

  <xsl:param name='bar'>failure</xsl:param>
  <xsl:template match='/'>
    This should say "success": <xsl:value-of select='$bar'/>
  </xsl:template>
</xsl:stylesheet>
""")

style = libxslt.parseStylesheetDoc(styledoc)
doc = libxml2.parseDoc("<doc/>")
result = style.applyStylesheet(doc, { "bar": "'success'" })
print result 
style.freeStylesheet()
doc.freeDoc()



Actual results:
 This should say "success": failure


Expected results:
 This should say "success": success


Does this happen every time?
On x86_64 platforms, yes. On i586 platforms it appears to function correctly.

Other information:
Confirmed by DV on IRC #xml