Fix double definition of ge25519_base in ed25519

src/libsodium/crypto_sign/ed25519/ref/ed25519_ed25519.c

@@ -6,6 +6,8 @@
 
 #include "ge25519.h"
 
+extern const ge25519 ge25519_base;
+
 static void get_hram(unsigned char *hram, const unsigned char *sm, const unsigned char *pk, unsigned char *playground, unsigned long long smlen)
 {
   unsigned long long i;

src/libsodium/crypto_sign/ed25519/ref/ge25519.h

@@ -20,8 +20,6 @@ typedef struct
   fe25519 t;
 } ge25519;
 
-const ge25519 ge25519_base;
-
 int ge25519_unpackneg_vartime(ge25519 *r, const unsigned char p[32]);
 
 void ge25519_pack(unsigned char r[32], const ge25519 *p);