[9.20] fix: dev: Add -Wno-psabi to CFLAGS for x86 (32-bit) builds
GCC 11.1+ emits a note during compilation when there are 64-bit atomic fields in a structure, because it fixed a compiler bug by changing the alignment of such fields, which caused ABI change.
Add -Wno-psabi to CFLAGS for such builds in order to silence the warning. That shouldn't be a problem since we don't expose our structures to the outside.
Closes #4841 (closed)
Backport of MR !9319 (merged)