Remove flags field from EC_KEY.

It doesn't do anything.

Change-Id: Ifcc2c824faf6012d2a442208b8204a32e141a650
Reviewed-on: https://boringssl-review.googlesource.com/7073
Reviewed-by: Adam Langley <agl@google.com>
diff --git a/crypto/ec/ec_key.c b/crypto/ec/ec_key.c
index a1f8619..f01bf6b 100644
--- a/crypto/ec/ec_key.c
+++ b/crypto/ec/ec_key.c
@@ -208,7 +208,6 @@
   /* copy the rest */
   dest->enc_flag = src->enc_flag;
   dest->conv_form = src->conv_form;
-  dest->flags = src->flags;
 
   return dest;
 }
diff --git a/crypto/ec/internal.h b/crypto/ec/internal.h
index 0299e1b..2b788c1 100644
--- a/crypto/ec/internal.h
+++ b/crypto/ec/internal.h
@@ -262,7 +262,6 @@
   point_conversion_form_t conv_form;
 
   CRYPTO_refcount_t references;
-  int flags;
 
   ECDSA_METHOD *ecdsa_meth;