Use /VA instead of /V5 for the APX prefix #158

Job	Run time
pre-check	3m 23s
build-all-delta-packs	0s
build-multiple-delta-packs	0s
build-delta-manifests	0s
bundle-commands	0s
clean-rebuild	0s
content-chroot	0s
config-conversion	0s
contentsize-check	0s
create-mix-with-blended-content	0s
update-mix-add-remove-bundles	0s
clr-installer-config	0s
create-mix-with-custom-content	0s
customize-os-release	0s
export-flag	0s
manual-format-bump-flow	0s
manual-upstream-format-bump-flow	0s
no-delta-manifests-over-format-bump	0s
no-delta-packs-over-format-bump	0s
no-state-variables-in-full	0s
state-conversion	0s
test-format-bump	0s
update-mixver-offline	0s
upstream-format-bump	0s
	3m 23s

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