Android/Makefile: Fix build by avoiding var-leakage

Apparently include $(CLEAR_VARS) doesn't quite do what one expects

shell/android/jni/Android.mk

@@ -24,17 +24,26 @@ WEBUI := 1
 
 ifneq ($(TARGET_ARCH_ABI),armeabi-v7a)
   NOT_ARM := 1
-  ifneq ($(TARGET_ARCH_ABI),x86)
-    NO_REC := 1
-  else
-    X86_REC := 1
-  endif
+else
+  NOT_ARM := 
+endif
+
+ifeq ($(TARGET_ARCH_ABI),x86)
+  X86_REC := 1
+else
+  X86_REC := 
 endif
 
 ifeq ($(TARGET_ARCH_ABI),mips)
   ISMIPS := 1
+  NO_REC := 1
+else
+  ISMIPS :=
+  NO_REC :=
 endif
 
+$(info $$TARGET_ARCH_ABI is [${TARGET_ARCH_ABI}])
+
 include $(LOCAL_PATH)/../../core/core.mk
 
 LOCAL_SRC_FILES := $(RZDCY_FILES)