Remove unused field in X509_NAME_ENTRY.

This is not used anywhere inside or outside the library.

Update-Note: Removed unused field in struct.

Change-Id: I244d8af819e84412956fecb929678404fdfcc38f
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/48427
Commit-Queue: David Benjamin <davidben@google.com>
Reviewed-by: Adam Langley <agl@google.com>

include/openssl/x509.h

diff --git a/include/openssl/x509.h b/include/openssl/x509.h
index 21cb696..1e745ca 100644
--- a/include/openssl/x509.h
+++ b/include/openssl/x509.h
@@ -118,7 +118,6 @@
   ASN1_OBJECT *object;
   ASN1_STRING *value;
   int set;
-  int size;  // temp variable
 } /* X509_NAME_ENTRY */;
 
 DEFINE_STACK_OF(X509_NAME_ENTRY)