Fix all warnings and enable -Werror for gptfdisk.

Bug: 26936282
Change-Id: Id7e9ec5e769e1abedc1d2e36bff2c5488b1c4b3e
diff --git a/Android.mk b/Android.mk
index 58885ad..245bd78 100644
--- a/Android.mk
+++ b/Android.mk
@@ -24,6 +24,7 @@
 
 LOCAL_C_INCLUDES := $(LOCAL_PATH) external/e2fsprogs/lib
 LOCAL_SRC_FILES := $(sgdisk_src_files)
+LOCAL_CFLAGS += -Wno-unused-parameter -Werror
 
 LOCAL_SHARED_LIBRARIES := libext2_uuid
 
@@ -41,6 +42,7 @@
 
 LOCAL_C_INCLUDES := $(LOCAL_PATH) external/e2fsprogs/lib
 LOCAL_SRC_FILES := $(sgdisk_src_files)
+LOCAL_CFLAGS += -Wno-unused-parameter -Werror
 
 LOCAL_SHARED_LIBRARIES := libext2_uuid-host