Check in the libxslt roll script.

third_party/libxslt/src/libexslt/exslt.c

 #define IN_LIBEXSLT
 #include "libexslt/libexslt.h"
 
 #include <libxml/xmlversion.h>
 
 #include "config.h"
 
 #include <libxslt/xsltconfig.h>
 #include <libxslt/extensions.h>
 
@@ skipping 20 matching lines @@
 #endif
     exsltMathRegister();
     exsltSetsRegister();
     exsltFuncRegister();
     exsltStrRegister();
     exsltDateRegister();
     exsltSaxonRegister();
     exsltDynRegister();
 }