tdf#135427 Make pstoedit delegate letter placement to us

As pstoedit documents itself, its wmf/emf driver uses a very approximate
interletter spacing, making the text look really awful. But it provides a
-nfw option that delegates the letter placement to the emf reader, and we
happen to be doing a proper job, thus getting a proper vectorized output.

This is not a concern on Windows (and the option is ignored there). The
option is available since version 3.40 (~2005). So we can just always pass
it on.

Change-Id: I8ffd3fbf046b5a80e8011651eeaf060a8f5107e2
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/100035
Tested-by: Jenkins
Reviewed-by: Michael Stahl <michael.stahl@cib.de>

filter/source/graphicfilter/ieps/ieps.cxx

@@ -220,9 +220,14 @@ static bool RenderAsEMF(const sal_uInt8* pBuf, sal_uInt32 nBytesRead, Graphic &r
     //-usebbfrominput forces pstoedit to take the original ps bounding box
     //as the bounding box as it sees it, instead of calculating its own
     //which also doesn't work for this example
+    //
+    //Under Linux, positioning of letters within pstoedit is very approximate.
+    //Using the -nfw option delegates the positioning to the reader, and we
+    //will do a proper job.  The option is ignored on Windows.
     OUString arg1("-usebbfrominput");   //-usebbfrominput use the original ps bounding box
     OUString arg2("-f");
-    OUString arg3("emf:-OO -drawbb");   //-drawbb mark out the bounding box extent with bg pixels
+    OUString arg3("emf:-OO -drawbb -nfw"); //-drawbb mark out the bounding box extent with bg pixels
+                                           //-nfw delegate letter placement to us
     rtl_uString *args[] =
     {
         arg1.pData, arg2.pData, arg3.pData, input.pData, output.pData