exfat: Build fsck and update path to mkfs

* Usage of fsck.exfat is already included in partition.cpp, but the
  tool is missing.
* Update the path to mkexfatfs so the button is available when changing
  filesystem.

Change-Id: I5f4e27357c6b5a8606043d1bdc2488cc83e55d90
diff --git a/exfat/fsck/Android.mk b/exfat/fsck/Android.mk
new file mode 100644
index 0000000..2cada95
--- /dev/null
+++ b/exfat/fsck/Android.mk
@@ -0,0 +1,16 @@
+LOCAL_PATH := $(call my-dir)
+
+include $(CLEAR_VARS)
+
+LOCAL_MODULE := fsckexfat
+LOCAL_MODULE_STEM := fsck.exfat
+LOCAL_MODULE_TAGS := optional
+LOCAL_MODULE_PATH := $(TARGET_RECOVERY_ROOT_OUT)/sbin
+LOCAL_CFLAGS = -D_FILE_OFFSET_BITS=64
+LOCAL_SRC_FILES =  main.c
+LOCAL_C_INCLUDES += $(LOCAL_PATH) \
+                    $(commands_recovery_local_path)/exfat/libexfat \
+                    $(commands_recovery_local_path)/fuse/include
+LOCAL_SHARED_LIBRARIES += libexfat_twrp
+
+include $(BUILD_EXECUTABLE)