GnuTLS

- Added GnuTLS discovery, linking.
- Added '+/-tls' indicator to diagnostics command.
- Added libgnutls version number to diagnostics command.
- Renamed wcwidth6.c to wcwidth6.cpp, to eliminate a strange build error.

src/commands/CmdDiagnostics.cpp

@@ -46,6 +46,10 @@ extern "C"
 }
 #endif
 
+#ifdef HAVE_LIBGNUTLS
+#include <gnutls/gnutls.h>
+#endif
+
 #include <CmdDiagnostics.h>
 
 extern Context context;
@@ -150,6 +154,14 @@ int CmdDiagnostics::execute (std::string& output)
       << "libuuid, no uuid_unparse_lower"
 #else
       << "n/a"
+#endif
+      << "\n";
+
+  out << "  libgnutls: "
+#ifdef HAVE_LIBGNUTLS
+      << GNUTLS_VERSION
+#else
+      << "n/a"
 #endif
       << "\n\n";
 
@@ -184,6 +196,12 @@ int CmdDiagnostics::execute (std::string& output)
 #else
       << " -uuid"
 #endif
+
+#ifdef HAVE_LIBGNUTLS
+      << " +tls"
+#else
+      << " -tls"
+#endif
       << "\n\n";
 
   // Config: .taskrc found, readable, writable