compiler/natives/syscall: Don't import bytes package.
compiler/natives/syscall: Don't import bytes package.

The real syscall package doesn't import bytes. This keeps the order in
which stdlib packages must be built in for GopherJS consistent with the
real standard library.

Helps #388.

gopherjs/gopherjs,albrow/gopherjs,albrow/gopherjs,gopherjs/gopherjs,albrow/gopherjs,gopherjs/gopherjs,gopherjs/gopherjs,gopherjs/gopherjs