#112 gnutls detection does not work

[Philippe Oechslin]

There is a comma missing in the configure.in script which prevents gnutls includes to be found:
86c86
< AC_CHECK_HEADERS([gnutls/gnutls.h, gnutls/openssl.h], [ gnutls_includes="yes" ])
---
> AC_CHECK_HEADERS([gnutls/gnutls.h gnutls/openssl.h], [ gnutls_includes="yes" ])

The file gnutls.h, does not exist.