GitHub #644 fails to build with flatbuffers 2.0.6

 * Fixed bug where flatbuffers was downloaded every time setup.sh was run.
 * setup.sh will attempt to use the version of flatbuffers used by
   android if one is available.
 * setup.sh will now generate ArmnnSchema_generated.h where one does
   not exist

!armnn:7625

Signed-off-by: Mike Kelly <mike.kelly@arm.com>
Change-Id: I62f3be6ebfc7fbef39597295dca194d70294646c
diff --git a/Android.mk b/Android.mk
index cab4a45..585d835 100644
--- a/Android.mk
+++ b/Android.mk
@@ -68,6 +68,7 @@
 endif
 
 # Configure these paths if you move the source or Khronos headers
+ARMNN_GENERATED_HEADER_PATH := $(LOCAL_PATH)/armnn/generated
 ARMNN_PROFILING_HEADER_PATH := $(LOCAL_PATH)/armnn/profiling
 ARMNN_COMMON_PROFILING_HEADER_PATH := $(LOCAL_PATH)/armnn/profiling/common/include
 ARMNN_CLIENT_PROFILING_HEADER_PATH := $(LOCAL_PATH)/armnn/profiling/client/include
@@ -77,7 +78,6 @@
 ARMNN_BACKEND_MAKEFILE_DIRS := $(subst /backend.mk,,$(ARMNN_BACKEND_MAKEFILE_PATHS))
 ARMNN_THIRD_PARTY_PATH := $(LOCAL_PATH)/armnn/third-party
 ARMNN_UTILS_HEADER_PATH := $(LOCAL_PATH)/armnn/src/armnnUtils
-ARMNN_THIRD_PARTY_PATH := $(LOCAL_PATH)/armnn/third-party
 OPENCL_HEADER_PATH := $(LOCAL_PATH)/clframework/include
 NN_HEADER_PATH := $(LOCAL_PATH)/../../../frameworks/ml/nn/runtime/include
 ifeq ($(S_OR_LATER),1)
@@ -152,6 +152,7 @@
 LOCAL_ADDITIONAL_DEPENDENCIES := $(LOCAL_PATH)/Android.mk
 
 LOCAL_C_INCLUDES := \
+        $(ARMNN_GENERATED_HEADER_PATH) \
         $(ARMNN_THIRD_PARTY_PATH) \
         $(ARMNN_PROFILING_HEADER_PATH) \
         $(ARMNN_COMMON_PROFILING_HEADER_PATH) \
@@ -285,6 +286,7 @@
 LOCAL_ADDITIONAL_DEPENDENCIES := $(LOCAL_PATH)/Android.mk
 
 LOCAL_C_INCLUDES := \
+        $(ARMNN_GENERATED_HEADER_PATH) \
         $(ARMNN_THIRD_PARTY_PATH) \
         $(ARMNN_PROFILING_HEADER_PATH) \
         $(ARMNN_COMMON_PROFILING_HEADER_PATH) \
@@ -414,6 +416,7 @@
 LOCAL_ADDITIONAL_DEPENDENCIES := $(LOCAL_PATH)/Android.mk
 
 LOCAL_C_INCLUDES := \
+        $(ARMNN_GENERATED_HEADER_PATH) \
         $(ARMNN_THIRD_PARTY_PATH) \
         $(ARMNN_PROFILING_HEADER_PATH) \
         $(ARMNN_COMMON_PROFILING_HEADER_PATH) \
@@ -543,6 +546,7 @@
 LOCAL_ADDITIONAL_DEPENDENCIES := $(LOCAL_PATH)/Android.mk
 
 LOCAL_C_INCLUDES := \
+        $(ARMNN_GENERATED_HEADER_PATH) \
         $(ARMNN_THIRD_PARTY_PATH) \
         $(ARMNN_PROFILING_HEADER_PATH) \
         $(ARMNN_COMMON_PROFILING_HEADER_PATH) \
@@ -678,6 +682,7 @@
 LOCAL_ADDITIONAL_DEPENDENCIES := $(LOCAL_PATH)/Android.mk
 
 LOCAL_C_INCLUDES := \
+        $(ARMNN_GENERATED_HEADER_PATH) \
         $(ARMNN_THIRD_PARTY_PATH) \
         $(ARMNN_PROFILING_HEADER_PATH) \
         $(ARMNN_COMMON_PROFILING_HEADER_PATH) \
@@ -784,6 +789,7 @@
 LOCAL_ADDITIONAL_DEPENDENCIES := $(LOCAL_PATH)/Android.mk
 
 LOCAL_C_INCLUDES := \
+        $(ARMNN_GENERATED_HEADER_PATH) \
         $(ARMNN_THIRD_PARTY_PATH) \
         $(ARMNN_PROFILING_HEADER_PATH) \
         $(ARMNN_COMMON_PROFILING_HEADER_PATH) \
@@ -882,6 +888,7 @@
 LOCAL_ADDITIONAL_DEPENDENCIES := $(LOCAL_PATH)/Android.mk
 
 LOCAL_C_INCLUDES := \
+        $(ARMNN_GENERATED_HEADER_PATH) \
         $(ARMNN_THIRD_PARTY_PATH) \
         $(ARMNN_PROFILING_HEADER_PATH) \
         $(ARMNN_COMMON_PROFILING_HEADER_PATH) \
@@ -976,6 +983,7 @@
 LOCAL_ADDITIONAL_DEPENDENCIES := $(LOCAL_PATH)/Android.mk
 
 LOCAL_C_INCLUDES := \
+        $(ARMNN_GENERATED_HEADER_PATH) \
         $(ARMNN_THIRD_PARTY_PATH) \
         $(ARMNN_PROFILING_HEADER_PATH) \
         $(ARMNN_COMMON_PROFILING_HEADER_PATH) \