This function is a deprecated version of |X509_EXT_nconf_nid| that takes
a hash of |CONF_VALUE|s directly rather than a |CONF|.

Change-Id: I5fd1025b31d73b988d9298b2624453017dd34ff4
Reviewed-on: https://boringssl-review.googlesource.com/7363
Reviewed-by: David Benjamin <davidben@google.com>