Fix compiler error about nested externs in slow_hash.c by moving declarations

src/crypto/slow-hash.c

@@ -44,6 +44,9 @@
 #define INIT_SIZE_BLK   8
 #define INIT_SIZE_BYTE (INIT_SIZE_BLK * AES_BLOCK_SIZE)
 
+extern int aesb_single_round(const uint8_t *in, uint8_t*out, const uint8_t *expandedKey);
+extern int aesb_pseudo_round(const uint8_t *in, uint8_t *out, const uint8_t *expandedKey);
+
 #if defined(__x86_64__) || (defined(_MSC_VER) && defined(_WIN64))
 // Optimised code below, uses x86-specific intrinsics, SSE2, AES-NI
 // Fall back to more portable code is down at the bottom
@@ -138,9 +141,6 @@
 #define THREADV __thread
 #endif
 
-extern int aesb_single_round(const uint8_t *in, uint8_t*out, const uint8_t *expandedKey);
-extern int aesb_pseudo_round(const uint8_t *in, uint8_t *out, const uint8_t *expandedKey);
-
 #pragma pack(push, 1)
 union cn_slow_hash_state
 {