Fix warnings, update generated parser

src/calc.h

@@ -10,6 +10,7 @@ double          equate_eval(void);
 const char     *equate_string_get(void);
 Eina_Bool	equate_ok(void);
 
+void		math_init(void);
 
 /* Fonctions type.                                   */
 typedef double  (*func_t) (double);

src/calc.y

@@ -1,11 +1,14 @@
 %{
 #include <math.h>               /* For math functions, cos(), sin(), etc. */
+#include "calc.h"
 #include "Equate.h"
 
 #define YYERROR_VERBOSE
 
 void
 yyerror (const char *s);
+int
+yylex();
 
 double _result;
 char tmp[BUFLEN];