Remove references to non-existant directories

Fixes warnings during makefile parsing:
FindEmulator: find: `frameworks/support/design/dummy': No such file or directory
FindEmulator: find: `frameworks/support/v17/leanback/dummy': No such file or directory
FindEmulator: find: `frameworks/support/v17/preference-leanback/dummy': No such file or directory

Test: builds
Merged-In: Ia9208246837347ce3d8df4adbe6b0ce406d3844a
Change-Id: If6c6628bb073ed2a66491177ff123cfc80a574bb
diff --git a/design/Android.mk b/design/Android.mk
index 38ca592..42ab3e0 100644
--- a/design/Android.mk
+++ b/design/Android.mk
@@ -27,7 +27,6 @@
 LOCAL_USE_AAPT2 := true
 LOCAL_MODULE := android-support-design-res
 LOCAL_SDK_VERSION := $(SUPPORT_CURRENT_SDK_VERSION)
-LOCAL_SRC_FILES := $(call all-java-files-under, dummy)
 LOCAL_RESOURCE_DIR := $(LOCAL_PATH)/res
 LOCAL_SHARED_ANDROID_LIBRARIES := $(resource_libs)
 LOCAL_AAPT_FLAGS := --no-version-vectors
diff --git a/v17/leanback/Android.mk b/v17/leanback/Android.mk
index 14b02ab..27824a6 100644
--- a/v17/leanback/Android.mk
+++ b/v17/leanback/Android.mk
@@ -22,7 +22,6 @@
 LOCAL_USE_AAPT2 := true
 LOCAL_MODULE := android-support-v17-leanback-res
 LOCAL_SDK_VERSION := $(SUPPORT_CURRENT_SDK_VERSION)
-LOCAL_SRC_FILES := $(call all-java-files-under, dummy)
 LOCAL_RESOURCE_DIR := $(LOCAL_PATH)/res
 LOCAL_JAR_EXCLUDE_FILES := none
 LOCAL_JAVA_LANGUAGE_VERSION := 1.7
diff --git a/v17/preference-leanback/Android.mk b/v17/preference-leanback/Android.mk
index 2058002..6e37fbd 100644
--- a/v17/preference-leanback/Android.mk
+++ b/v17/preference-leanback/Android.mk
@@ -31,7 +31,6 @@
 LOCAL_USE_AAPT2 := true
 LOCAL_MODULE := android-support-v17-preference-leanback-res
 LOCAL_SDK_VERSION := $(SUPPORT_CURRENT_SDK_VERSION)
-LOCAL_SRC_FILES := $(call all-java-files-under, dummy)
 LOCAL_RESOURCE_DIR := $(LOCAL_PATH)/res
 LOCAL_SHARED_ANDROID_LIBRARIES := $(resource_libs)
 LOCAL_JAVA_LANGUAGE_VERSION := 1.7