Add libc_malloc_{debug,hooks}.so to the absence check.

They should only be in the Runtime APEX, c.f. discussion on
http://r.android.com/957159.

Test: build/soong/build_test.bash through Forrest
Bug: 124293228
Change-Id: I33e97a56e67c3f4734d14f38e0f1597b697a2604

core/main.mk

@@ -1214,6 +1214,8 @@ APEX_MODULE_LIBS := \
   libartd.so \
   libartpalette.so \
   libc.so \
+  libc_malloc_debug.so \
+  libc_malloc_hooks.so \
   libdexfile.so \
   libdexfile_external.so \
   libdexfiled.so \