oovbaapi: add Application.OperatingSystem property

stub

As documented at:
https://msdn.microsoft.com/en-us/vba/excel-vba/articles/application-operatingsystem-property-excel

Change-Id: I2ccf17c698eb631e7b5ca420752b2268d2142d2a
Reviewed-on: https://gerrit.libreoffice.org/39208
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Tamás Bunth <btomi96@gmail.com>

oovbaapi/ooo/vba/excel/XApplication.idl

@@ -67,6 +67,7 @@ interface XApplication
     [attribute, readonly] string LibraryPath;
     [attribute, readonly] string TemplatesPath;
     [attribute, readonly] string PathSeparator;
+    [attribute, readonly] string OperatingSystem;
 
     void setDefaultFilePath([in] string DefaultFilePath) raises(com::sun::star::script::BasicErrorException);
 

sc/source/ui/vba/vbaapplication.cxx

@@ -914,6 +914,14 @@ ScVbaApplication::getPathSeparator()
     return OUString( (sal_Unicode) SAL_PATHDELIMITER );
 }
 
+OUString SAL_CALL
+ScVbaApplication::getOperatingSystem()
+{
+    // TODO implement
+    SAL_WARN("sc", "not implemented");
+    return OUString();
+}
+
 // Helpers for Intersect and Union
 
 namespace {

sc/source/ui/vba/vbaapplication.hxx

@@ -67,6 +67,7 @@ public:
     virtual OUString SAL_CALL getPathSeparator() override;
     virtual OUString SAL_CALL getLibraryPath() override;
     virtual OUString SAL_CALL getTemplatesPath() override;
+    virtual OUString SAL_CALL getOperatingSystem() override;
 
     virtual OUString SAL_CALL getName() override;
     virtual sal_Bool SAL_CALL getDisplayAlerts() override;