Don't use prebuilt modules for sanitizer builds.

Prebuilt modules do not provide sanitizer binaries to using them in this
context is unsafe.

Bug: 194067130
Test: TH
Change-Id: I3682ae9ad963a8cd13bb395fe84dae515dc6d30f

core/android_soong_config_vars.mk

@@ -49,6 +49,7 @@ else ifneq (,$(filter true,$(NATIVE_COVERAGE) $(CLANG_COVERAGE)))
 else ifneq (,$(SANITIZE_TARGET)$(SANITIZE_HOST))
   # Prebuilts aren't built with sanitizers either.
   SOONG_CONFIG_art_module_source_build := true
+  MODULE_BUILD_FROM_SOURCE := true
 else ifneq (,$(PRODUCT_FUCHSIA))
   # Fuchsia picks out ART internal packages that aren't available in the
   # prebuilt.