dev-lang/go fix issue with Roll to 1.15.7

After this CL 2641341

Go package is being built instead of trying to use prebuilt.

BUG=chromium:1172047
TEST=none (emergency fix)

Exempt-From-Owner-Approval:need to provide an urgent fix. After hours for reviewers
Change-Id: Ic2e84f6e63bda75e4b33c544b29d95ba13b6259e
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosutils/+/2658138
Commit-Queue: Luis Lozano <llozano@chromium.org>
Tested-by: Luis Lozano <llozano@chromium.org>
Reviewed-by: Manoj Gupta <manojgupta@chromium.org>
Reviewed-by: Ricky Liang <jcliang@chromium.org>
diff --git a/build_packages b/build_packages
index 3e1ee38..4dfd889 100755
--- a/build_packages
+++ b/build_packages
@@ -444,6 +444,7 @@
 # being upgraded transitively via BDEPEND relations.
 CRITICAL_SDK_PACKAGES=(
   "dev-lang/rust"
+  "dev-lang/go"
   "sys-libs/glibc"
   "sys-devel/gcc"
 )