Revert "Revert "bump the extra --version info from info to notice, -vv -> -v""

This reverts commit 9f16a20f3d.

Since c55e93ca2, the original reason for reverting d003dcd7f
no longer applies.

Change-Id: If88f8555a6060d0530dcfecdf55afaa40afd1ad9

src/libmain/shared.cc

@@ -281,7 +281,7 @@ void parseCmdLine(const std::string & programName, const Strings & args,
 void printVersion(const std::string & programName)
 {
     std::cout << fmt("%1% (Lix, like Nix) %2%", programName, nixVersion) << std::endl;
-    if (verbosity > lvlInfo) {
+    if (verbosity > lvlNotice) {
         Strings cfg;
 #if HAVE_BOEHMGC
         cfg.push_back("gc");