Switch options and mode bits to uint32_t from unsigned long.

This is a bitmask, so the number of bits available should be the same
across all platforms.

Change-Id: I98e8d375fc7d042aeae1270174bc8fc63fba5dfc
Reviewed-on: https://boringssl-review.googlesource.com/4556
Reviewed-by: Adam Langley <agl@google.com>

include/openssl/ssl.h

@@ -837,8 +837,8 @@ struct ssl_ctx_st {
   /* Default values to use in SSL structures follow (these are copied by
    * SSL_new) */
 
-  unsigned long options;
-  unsigned long mode;
+  uint32_t options;
+  uint32_t mode;
   long max_cert_list;
 
   struct cert_st /* CERT */ *cert;
@@ -1340,8 +1340,8 @@ struct ssl_st {
   /* for server side, keep the list of CA_dn we can use */
   STACK_OF(X509_NAME) *client_CA;
 
-  unsigned long options; /* protocol behaviour */
-  unsigned long mode;    /* API behaviour */
+  uint32_t options; /* protocol behaviour */
+  uint32_t mode;    /* API behaviour */
   long max_cert_list;
   int client_version; /* what was passed, used for
                        * SSLv3/TLS rollback check */

ssl/ssl_lib.c

@@ -2833,7 +2833,7 @@ uint16_t ssl3_get_mutual_version(SSL *s, uint16_t client_version) {
 }
 
 uint16_t ssl3_get_max_client_version(SSL *s) {
-  unsigned long options = s->options;
+  uint32_t options = s->options;
   uint16_t version = 0;
 
   /* OpenSSL's API for controlling versions entails blacklisting individual