Fix build breakage.

Author: briansmith

third_party/fiat/curve25519.c

@@ -266,21 +266,21 @@ static void fe_tobytes(uint8_t s[32], const fe *f) {
 
 // h = 0
 static void fe_0(fe *h) {
-  OPENSSL_memset(h, 0, sizeof(fe));
+  memset(h, 0, sizeof(fe));
 }
 
 static void fe_loose_0(fe_loose *h) {
-  OPENSSL_memset(h, 0, sizeof(fe_loose));
+  memset(h, 0, sizeof(fe_loose));
 }
 
 // h = 1
 static void fe_1(fe *h) {
-  OPENSSL_memset(h, 0, sizeof(fe));
+  memset(h, 0, sizeof(fe));
   h->v[0] = 1;
 }
 
 static void fe_loose_1(fe_loose *h) {
-  OPENSSL_memset(h, 0, sizeof(fe_loose));
+  memset(h, 0, sizeof(fe_loose));
   h->v[0] = 1;
 }