hmac/sha256: move size define to sha256.h

src/basic/hmac.h

@@ -4,7 +4,7 @@
 #include <stdint.h>
 #include <stdlib.h>
 
-#define SHA256_DIGEST_SIZE 32
+#include "sha256.h"
 
 /* Unoptimized implementation based on FIPS 198. 'res' has to be allocated by
  * the caller. Prefer external OpenSSL functions, and use this only when

src/fundamental/sha256.h

@@ -8,6 +8,8 @@
 
 #include "types-fundamental.h"
 
+#define SHA256_DIGEST_SIZE 32
+
 struct sha256_ctx {
         uint32_t H[8];