test-gdb: ok, it actually works now and exits a failure, OMG I hate threads

run-gdb

@@ -152,8 +152,7 @@ See: https://github.com/cirosantilli/linux-kernel-module-cheat#gdb-builtin-cpu-s
             allowed_toolchains = ['buildroot', 'crosstool-ng', 'host']
         cmd = (
             [self.get_toolchain_tool('gdb', allowed_toolchains=allowed_toolchains), LF] +
-            before +
-            ['-q', LF]
+            before
         )
         if linux_full_system:
             cmd.extend(['-ex', 'add-auto-load-safe-path {}'.format(self.env['linux_build_dir']), LF])