Build com.android.runtime in mixed builds presubmits.

Test: TH
Change-Id: I42da6a1dda94fe37a5176593ee3d85afb94b7dde
diff --git a/ci/mixed_libc.sh b/ci/mixed_libc.sh
index 2b4a822..2b5347f 100755
--- a/ci/mixed_libc.sh
+++ b/ci/mixed_libc.sh
@@ -24,3 +24,6 @@
 # This is a small module which uses propagated includes from libc; thus will
 # fail if includes are not propagated appropriately from bazel-built libc.
 build/soong/soong_ui.bash --make-mode USE_BAZEL_ANALYSIS=1 BAZEL_STARTUP_ARGS="--max_idle_secs=5" BAZEL_BUILD_ARGS="--color=no --curses=no --show_progress_rate_limit=5" TARGET_PRODUCT=aosp_arm64 TARGET_BUILD_VARIANT=userdebug libbacktrace dist DIST_DIR=$DIST_DIR
+
+# Build com.android.runtime, which is basically Bionic (and other stuff) in an APEX.
+build/soong/soong_ui.bash --make-mode USE_BAZEL_ANALYSIS=1 BAZEL_STARTUP_ARGS="--max_idle_secs=5" BAZEL_BUILD_ARGS="--color=no --curses=no --show_progress_rate_limit=5" TARGET_PRODUCT=aosp_arm64 TARGET_BUILD_VARIANT=userdebug com.android.runtime dist DIST_DIR=$DIST_DIR