Don't run testTdf107868 on Windows, since it's using GDI

The intent of the test is to trigger PDF export. On Windows, GDI printing
is used, so no use to run it (and it would provide a sane PDF with 2 white
paths).

Change-Id: I808807ce0d339cccbb3d097f486d2562e7b2819f
Reviewed-on: https://gerrit.libreoffice.org/52072Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
Tested-by: Jenkins <ci@libreoffice.org>

vcl/qa/cppunit/pdfexport/pdfexport.cxx

@@ -288,9 +288,10 @@ void PdfExportTest::testTdf105461()
 
 void PdfExportTest::testTdf107868()
 {
+    // No need to run it on Windows, since it would use GDI printing, and not trigger PDF export
+    // which is the intent of the test.
     // FIXME: Why does this fail on macOS?
-    // FIXME: Why does this fail when building 64bit?
-#if !defined MACOSX && !defined _WIN64
+#if !defined MACOSX && !defined _WIN32
     // Import the bugdoc and print to PDF.
     OUString aURL = m_directories.getURLFromSrc(DATA_DIRECTORY) + "tdf107868.odt";
     mxComponent = loadFromDesktop(aURL);