Refactor of use of fstab in advance of fix.

Test: Ensure device still boots.
Bug: 65737446
Change-Id: Ie466db9f5d8c77656cc525c0d49fe6a3cce154f1
diff --git a/Android.mk b/Android.mk
index 4d812b7..dae747e 100644
--- a/Android.mk
+++ b/Android.mk
@@ -12,7 +12,7 @@
 	Devmapper.cpp \
 	CheckBattery.cpp \
 	Ext4Crypt.cpp \
-	VoldUtil.c \
+	VoldUtil.cpp \
 	cryptfs.cpp \
 	model/Disk.cpp \
 	model/VolumeBase.cpp \