Added libxslt initialization to main()

It worked without this. Just to be on the safe side...

src/astrognome.c

@@ -4,6 +4,7 @@
 #include <glib/gi18n.h>
 #include <libxml/xmlversion.h>
 #include <libxml/parser.h>
+#include <libxslt/xslt.h>
 #include <libexslt/exslt.h>
 
 #include <libgd/gd.h>
@@ -92,6 +93,7 @@ main(int argc, char *argv[])
     LIBXML_TEST_VERSION;
     xmlSubstituteEntitiesDefault(1);
     xmlLoadExtDtdDefaultValue = 1;
+    xsltInit();
     exsltRegisterAll();
     gswe_init();