build-support: update `addBinToPathHook`, use `postHooks`

Changed files
+1 -2
pkgs
build-support
setup-hooks
+1 -2
pkgs/build-support/setup-hooks/add-bin-to-path.sh
···
export PATH
}
-
# shellcheck disable=SC2154
-
addEnvHooks "$targetOffset" addBinToPath
+
postHooks+=(addBinToPath)