Improve the Windows code a bit

ucb/source/ucp/odma/odma_lib.cxx

@@ -80,16 +80,23 @@ namespace odma
         if (bBeenHere)
             return bLoaded;
 
+        bBeenHere = sal_True;
+
         ::rtl::OUString sPath;
     #ifdef WNT
-        sPath = ::rtl::OUString(RTL_CONSTASCII_USTRINGPARAM("ODMA32.DLL"));
+        wchar_t system32[MAX_PATH];
+        UINT n = GetSystemDirectoryW( system32, MAX_PATH );
+
+        if (n == 0)
+            return sal_False;
+
+        sPath = ::rtl::OUString( system32, n ) + ::rtl::OUString(RTL_CONSTASCII_USTRINGPARAM("ODMA32.DLL"));
+
     #endif
     #ifdef UNX
         sPath = ::rtl::OUString(RTL_CONSTASCII_USTRINGPARAM("libodma.so"));
     #endif
 
-        bBeenHere = sal_True;
-
         pODMA = osl_loadModule( sPath.pData,SAL_LOADMODULE_NOW );
         if( !pODMA)
             return sal_False;