CI: eliminate a warning with brew

cburstedde · cburstedde · commit c13e31ff28c4 · 2022-09-14T12:49:54.000+02:00
diff --git a/libb64/cencode.c b/libb64/cencode.c
@@ -12,7 +12,9 @@ For details, see http://sourceforge.net/projects/libb64
 
 #include "libb64.h"
 
+#ifdef SC_BASE64_WRAP
 const int           CHARS_PER_LINE = 72;
+#endif
 
 static inline char
 base64_encode_value (char value_in)
