Remove files/patch-dlls_kernel32_Makefile.in which should be a noop
based on an exchanged I've had with upstream.

Firstly, commits 55ba3648379d90642f174e74809b84130d6d1ddc and
e0138c4a6a7a87f1d25badd43e05490e706bc666 should obviate it need.

Secondly, and more importantly, winegcc passes that flag already
since

commit e59395208d527d1bffb2725efc85fb798aee7610
Author: Alexandre Julliard <julliard@winehq.org>
Date:   Mon Mar 28 15:47:19 2016 +0900

makefiles: Reduce the maximum page size for modules that have a base address.

It avoid bumping into the next allocated base address on 64-bit.