Ensure proper types for arguments to time.Unix.

When compiling for armv7, the type is `int32` for `Timespec.Sec` and
`Timespec.Nsec` in the syscall package. When passing these values
to `time.Unix`, the values must be converted to `int64`.

Signed-off-by: Kevin Swiber <kswiber@gmail.com>

content/store_unix.go

@@ -10,7 +10,7 @@ import (
 
 func getStartTime(fi os.FileInfo) time.Time {
 	if st, ok := fi.Sys().(*syscall.Stat_t); ok {
-		return time.Unix(st.Ctim.Sec, st.Ctim.Nsec)
+		return time.Unix(int64(st.Ctim.Sec), int64(st.Ctim.Nsec))
 	}
 
 	return fi.ModTime()