Fix --disable-pch build on Windows

Restore inclusion of <unotools/transliterationwrapper.hxx>, added
in 63f7efe613 to fix exactly the same
problem that reappeared now after removing it in commit
fe88ffb661.

This partially reverts fe88ffb661,
making the inclusion conditional.

Change-Id: Iab6893549377e1b8f2f96150b09b7294c9476fa2
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/106555
Tested-by: Jenkins
Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>

sw/source/core/doc/docfld.cxx

@@ -24,6 +24,9 @@
 #include <comphelper/string.hxx>
 #include <osl/diagnose.h>
 #include <unotools/charclass.hxx>
+#ifndef UNX
+#include <unotools/transliterationwrapper.hxx>
+#endif
 #include <doc.hxx>
 #include <IDocumentFieldsAccess.hxx>
 #include <IDocumentState.hxx>