explicitly depend on libcurl4-openssl-dev until issue #1 is resolved

debian/control

@@ -4,7 +4,7 @@ Priority: extra
 Maintainer: Autistici/Inventati <debian@autistici.org>
 Build-Depends: debhelper (>= 8.0.0), build-essential,
  python (>= 2.6.6-3~), python-setuptools, autoconf, automake, libtool,
- libcurl4-openssl-dev | libcurl4-gnutls-dev, libpam0g-dev
+ libcurl4-openssl-dev, libpam0g-dev
 Standards-Version: 3.9.4
 
 Package: libpam-authclient