Add LOCAL_OVERRIDES_MODULES

LOCAL_OVERRIDES_MODULES is similar to LOCAL_OVERRIDES_PACKAGES, but is
for executables.

Bug: 36491275
Test: LOCAL_OVERRIDES_MODULES := foo should prevent a target executable
foo from being installed. If foo is not a target executable, error
should be reported.

Change-Id: I558f3d94105f9e319f8413c1290799f1c70ee131
diff --git a/core/clear_vars.mk b/core/clear_vars.mk
index f30c4ba..3f8d822 100644
--- a/core/clear_vars.mk
+++ b/core/clear_vars.mk
@@ -162,6 +162,7 @@
 LOCAL_ODM_MODULE:=
 LOCAL_OEM_MODULE:=
 LOCAL_OVERRIDES_PACKAGES:=
+LOCAL_OVERRIDES_MODULES:=
 LOCAL_PACKAGE_NAME:=
 LOCAL_PACKAGE_SPLITS:=
 LOCAL_PACK_MODULE_RELOCATIONS:=