Create jwt_verifier.c

src/core/lib/security/credentials/jwt/jwt_verifier.c

@@ -465,7 +465,7 @@ static BIGNUM *bignum_from_base64(grpc_exec_ctx *exec_ctx, const char *b64) {
 #if OPENSSL_VERSION_NUMBER < 0x10100000L
 
 // Provide compatibility across OpenSSL 1.02 and 1.1.
-int RSA_set0_key(RSA *r, BIGNUM *n, BIGNUM *e, BIGNUM *d)
+static int RSA_set0_key(RSA *r, BIGNUM *n, BIGNUM *e, BIGNUM *d)
 {
     /* If the fields n and e in r are NULL, the corresponding input
      * parameters MUST be non-NULL for n and e.  d may be