Using the make-file function, in this case no converting

this problem was introduced by switching to native Win32 make:

* Makefiles don't have any metadata to specify the encoding
* all of the Cygwin tools in the build system assume
   everything is UTF-8 encoded
* Win32 make calls CreateProcessA(), which converts the
   arguments from some so-called "ANSI" codepage to UCS-2

hence in commands invoked from make, the UTF-8 string is
erroneously interpreted as latin1 and converted to UCS-2.

Change-Id: Ibf3e573b07e7e2d9119e0ff7b4972d8065d84bea
Reviewed-on: https://gerrit.libreoffice.org/56272Reviewed-by: Michael Stahl <Michael.Stahl@cib.de>
Tested-by: Michael Stahl <Michael.Stahl@cib.de>