fast_install_packages: Skip cros-go_pkg_postinst

cros-go_pkg_postinst does nothing for binary packages.

BUG=b:303323101
TEST=BOARD=amd64-generic bazel build @portage//host/dev-go/cmp
TEST=cat bazel-bin/external/_main~portage~portage/internal/packages/\
     stage2/host/chromiumos/dev-go/cmp/cmp-0.5.6-r3_host_deps.log

Change-Id: I50d8460e9cf782bf9c2ee64f478ecb86676ef25f
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/bazel/+/5051001
Reviewed-by: Maksim Ivanov <[email protected]>
Tested-by: Shuhei Takahashi <[email protected]>
Commit-Queue: Shuhei Takahashi <[email protected]>

Author: nya3jp

portage/bin/fast_install_packages/pkg_hook_check.sh

@@ -21,6 +21,9 @@ for f in {,pre_,post_}pkg_{setup,preinst,postinst}; do
   'pkg_setup () { cros-workon_pkg_setup "$@" } ')
     # cros-workon_pkg_setup does nothing for binary packages.
     ;;
+  'pkg_postinst () { cros-go_pkg_postinst "$@" } ')
+    # cros-go_pkg_postinst does nothing for binary packages.
+    ;;
   *)
     echo "${f} has a custom definition:"
     declare -f "${f}"