Without the change build on `gcc-11` fails as:
$ nix build --impure --expr 'with import ./. {}; gst_all_1.gst-plugins-bad.override { stdenv = gcc11Stdenv; }' -L
...
include/glib-2.0/glib/gatomic.h:113:19: error: argument 2 of '__atomic_load' must not be a pointer to a 'volatile' type
113 | __atomic_load (gapg_temp_atomic, &gapg_temp_newval, __ATOMIC_SEQ_CST); \
| ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
5881a720d3