Revert "vmimage.subr: pkg autoremove after pkg install"

This reverts commit 6a13aeac3c.

The "bogus dependencies being installed" issue was traced down to pkg
confusion surrounding libclang_rt.asan-i386.so linking to a 32-bit
libgcc_s.so.1, and a more minimal workaround of "install clibs-lib32"
has been applied, so this hack is no longer required.

MFC after:	3 days
Sponsored by:	Amazon

release/tools/vmimage.subr

@@ -213,13 +213,6 @@ vm_extra_install_packages() {
 		    -r ${DESTDIR} \
 		    install -y -r ${PKG_REPO_NAME} $pkg
 	done
-	INSTALL_AS_USER=yes \
-	    ${PKG_CMD} \
-	    -o ABI=${PKG_ABI} \
-	    -o REPOS_DIR=${PKG_REPOS_DIR} \
-	    -o PKG_DBDIR=${DESTDIR}/var/db/pkg \
-	    -r ${DESTDIR} \
-	    autoremove -y
 	if [ -n "${NOPKGBASE}" ]; then
 		metalog_add_data ./var/db/pkg/local.sqlite
 	fi