cffi: remove code from pattern structure

This patch updates the pattern structure according to libyang v4 and
removes the code variable

Signed-off-by: Stefan Gula <steweg@gmail.com>

Author: steweg

cffi/cdefs.h

@@ -982,7 +982,6 @@ typedef struct pcre2_real_code pcre2_code;
 
 struct lysc_pattern {
     const char *expr;
-    pcre2_code *code;
     const char *dsc;
     const char *ref;
     const char *emsg;