tdf#124936 Show "(x86)" in About dialog on the 32-bit version

... installed on Windows.

Change-Id: I2a4d846265b69f0e46e4c711430689ce39d60fcd
Reviewed-on: https://gerrit.libreoffice.org/73211Reviewed-by: Michael Stahl <Michael.Stahl@cib.de>
Tested-by: Michael Stahl <Michael.Stahl@cib.de>
(cherry picked from commit 932c1bd9)
Reviewed-on: https://gerrit.libreoffice.org/73313
Tested-by: Jenkins
Reviewed-by: Xisco Faulí <xiscofauli@libreoffice.org>

cui/source/dialogs/about.cxx

@@ -304,6 +304,8 @@ OUString AboutDialog::GetVersionString()
 
 #ifdef _WIN64
     sVersion += " (x64)";
+#elif defined(_WIN32)
+    sVersion += " (x86)";
 #endif
 
     OUString sBuildId = GetBuildId();