Fix FTBFS for build without tdehwlib.

Signed-off-by: François Andriot <francois.andriot@free.fr>
Signed-off-by: Slávek Banko <slavek.banko@axis.cz>
(cherry picked from commit 82e214c84f)

tdecore/tdeglobal.h

@@ -25,8 +25,10 @@ class KCharsets;
 class TDEConfig;
 class TDESharedConfig;
 class TDEIconLoader;
+#ifdef __TDE_HAVE_TDEHWLIB
 class TDEHardwareDevices;
 class TDEGlobalNetworkManager;
+#endif
 class TDELocale;
 class TDEStandardDirs;
 class KStaticDeleterBase;
@@ -79,6 +81,7 @@ public:
      */
     static TDEIconLoader	        *iconLoader();
 
+#ifdef __TDE_HAVE_TDEHWLIB
     /**
      *  Returns a TDEHardwareDevices object.
      * @return the global hardware devices object
@@ -90,6 +93,7 @@ public:
      * @return the global network manager object
      */
     static TDEGlobalNetworkManager   *networkManager();
+#endif
 
     /**
      * Returns the global locale object.