tdf#116344: Don’t Kashida justify Syriac text

I’ve always suspected this check in VCL is wrong since Writer calculates
Kashida positions for Arabic only. If we *really* want to Kashida
justify Syriac, then Writer has to be first taught how to calculate
Kashida positions for it.

Change-Id: I20c03a3a54bce14c9bebb55426bd22537fe50d6a
Reviewed-on: https://gerrit.libreoffice.org/51223Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Khaled Hosny <khaledhosny@eglug.org>

vcl/source/gdi/CommonSalLayout.cxx

@@ -723,8 +723,7 @@ bool CommonSalLayout::LayoutText(ImplLayoutArgs& rArgs)
                 if (u_isUWhiteSpace(aChar))
                      nGlyphFlags |= GlyphItem::IS_SPACING;
 
-                if ((aSubRun.maScript == HB_SCRIPT_ARABIC ||
-                     aSubRun.maScript == HB_SCRIPT_SYRIAC) &&
+                if (aSubRun.maScript == HB_SCRIPT_ARABIC &&
                     HB_DIRECTION_IS_BACKWARD(aSubRun.maDirection) &&
                     (nGlyphFlags & GlyphItem::IS_SPACING) == 0)
                 {