Delete the misleading var TARGET_OUT_STATIC_LIBRARIES.

Which can be replaced by TARGET_OUT_INTERMEDIATE_LIBRARIES.

Change-Id: I965ff1ebe70fc3113c19e4896277c876dcedb6a5
diff --git a/core/prebuilt.mk b/core/prebuilt.mk
index b06bb6e..f59a17b 100644
--- a/core/prebuilt.mk
+++ b/core/prebuilt.mk
@@ -35,6 +35,13 @@
   prebuilt_module_is_a_library :=
 endif
 
+# Don't install static libraries by default.
+ifndef LOCAL_UNINSTALLABLE_MODULE
+ifeq (STATIC_LIBRARIES,$(LOCAL_MODULE_CLASS))
+  LOCAL_UNINSTALLABLE_MODULE := true
+endif
+endif
+
 ifeq ($(LOCAL_STRIP_MODULE),true)
   ifdef LOCAL_IS_HOST_MODULE
     $(error Cannot strip host module LOCAL_PATH=$(LOCAL_PATH))