*: fix builds by disregarding warning from new glibc

Also, in case of collectd, the -lgcc_s shouldn't be needed anymore,
as the library is in ${glibc}/lib/ now, which is practically always on RPATH.

In case of seyren it was some stdenv change uncovering the mistake of
putting src into buildInputs.

pkgs/servers/monitoring/seyren/default.nix

@@ -11,7 +11,7 @@ stdenv.mkDerivation rec {
 
   phases = ["installPhase"];
 
-  buildInputs = [ makeWrapper jre src ];
+  buildInputs = [ makeWrapper jre ];
 
   installPhase = ''
     mkdir -p "$out"/bin