fsck_msdos should admit to using BSD extensions.

Change-Id: I5ee7faa9f22a0af5609c1b1a692501c783b3d69b
diff --git a/Android.mk b/Android.mk
index bafd757..51a2479 100644
--- a/Android.mk
+++ b/Android.mk
@@ -6,7 +6,7 @@
 
 LOCAL_C_INCLUDES := external/fsck_msdos/
 
-LOCAL_CFLAGS := -O2 -g -W -Wall -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64
+LOCAL_CFLAGS := -O2 -g -W -Wall -D_BSD_SOURCE -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64
 
 LOCAL_MODULE := fsck_msdos
 LOCAL_MODULE_TAGS :=