Added more standard library header #includes to C code to be strict.

c/qrcodegen-demo.c

@@ -25,6 +25,7 @@
  *   Software.
  */
 
+#include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include "qrcodegen.h"

c/qrcodegen-test.c

@@ -27,6 +27,8 @@
 
 #include <assert.h>
 #include <limits.h>
+#include <stdbool.h>
+#include <stddef.h>
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>

c/qrcodegen.c

@@ -24,6 +24,7 @@
 
 #include <assert.h>
 #include <limits.h>
+#include <stddef.h>
 #include <stdlib.h>
 #include <string.h>
 #include "qrcodegen.h"