Build Debian packages with OpenSSL instead of GnuTLS

OpenSSL allows to reload used certificates on runtime for example (which
is very useful when using Let's Encrypt), and therefore is preferred ...

contrib/Debian/changelog

@@ -1,3 +1,9 @@
+ngircd (24~rc1-0ab2) unstable; urgency=medium
+
+  * Use OpenSSL instead of GnuTLS for SSL-enabled packages.
+
+ -- Alexander Barton <alex@barton.de>  Fri, 20 Jan 2017 15:20:07 +0100
+
 ngircd (24~rc1-0ab1) unstable; urgency=low
 
   * New "upstream" release candidate 1 for ngIRCd Release 24.

contrib/Debian/control

@@ -6,11 +6,11 @@ Build-Depends: debhelper (>> 9.0.0),
     autotools-dev,
     dh-systemd (>= 1.5),
     expect,
-    libz-dev,
-    libwrap0-dev,
     libident-dev,
-    libgnutls28-dev,
     libpam0g-dev,
+    libssl-dev,
+    libwrap0-dev,
+    libz-dev,
     telnet | telnet-ssl,
 Standards-Version: 3.9.1
 

contrib/Debian/rules

@@ -55,7 +55,7 @@ configure-ngircd-full: configure
 	  --mandir=\$${prefix}/share/man \
 	  --docdir=\$${prefix}/share/doc/ngircd-full \
 	  --with-syslog --with-zlib \
-	  --with-gnutls --with-iconv --with-ident --with-tcp-wrappers \
+	  --with-openssl --with-iconv --with-ident --with-tcp-wrappers \
 	  --with-pam \
 	  --enable-ipv6
 
@@ -70,7 +70,7 @@ configure-ngircd-full-dbg: configure
 	  --docdir=\$${prefix}/share/doc/ngircd-full-dbg \
 	  --enable-debug --enable-sniffer \
 	  --with-syslog --with-zlib \
-	  --with-gnutls --with-iconv --with-ident --with-tcp-wrappers \
+	  --with-openssl --with-iconv --with-ident --with-tcp-wrappers \
 	  --with-pam \
 	  --enable-ipv6