blobfuse: fix build with gcc8

pkgs/tools/filesystems/blobfuse/default.nix

@@ -11,6 +11,8 @@ stdenv.mkDerivation rec {
     sha256 = "1qh04z1fsj1l6l12sz9yl2sy9hwlrnzac54hwrr7wvsgv90n9gbp";
   };
 
+  NIX_CFLAGS_COMPILE = [ "-Wno-error=catch-value" ];
+
   buildInputs = [ curl gnutls libgcrypt libuuid fuse ];
   nativeBuildInputs = [ cmake pkgconfig ];
 
@@ -20,4 +22,4 @@ stdenv.mkDerivation rec {
     maintainers = with maintainers; [ jbgi ];
     platforms = platforms.linux;
   };
-}
+}