upgrade to latest swi

os/pl-text.h

@@ -81,4 +81,11 @@ COMMON(int)		get_atom_ptr_text(Atom atom, PL_chars_t *text);
 COMMON(int)		get_atom_text(atom_t atom, PL_chars_t *text);
 COMMON(int)		get_string_text(atom_t atom, PL_chars_t *text ARG_LD);
 
+static inline int
+text_get_char(const PL_chars_t *t, size_t i)
+{ assert(t->canonical);
+  return t->encoding == ENC_ISO_LATIN_1 ? t->text.t[i]&0xff
+					: t->text.w[i];
+}
+
 #endif /*PL_TEXT_H_INCLUDED*/