Use the DEFAULT_DRIVER_DIR macro

Unused since commit bc2f42a0.

Move it under the WITHOUT_DRIVER_MODULES #ifdef
and start using it again.

src/driver.c

@@ -35,13 +35,13 @@
 
 VIR_LOG_INIT("driver");
 
-#define DEFAULT_DRIVER_DIR LIBDIR "/libvirt/connection-driver"
 
 #ifdef WITH_DRIVER_MODULES
 
 /* XXX re-implment this for other OS, or use libtools helper lib ? */
 
 # include <dlfcn.h>
+# define DEFAULT_DRIVER_DIR LIBDIR "/libvirt/connection-driver"
 
 void *
 virDriverLoadModule(const char *name)
@@ -57,7 +57,7 @@ virDriverLoadModule(const char *name)
                                             "libvirt_driver_",
                                             ".so",
                                             abs_topbuilddir "/src/.libs",
-                                            LIBDIR "/libvirt/connection-driver",
+                                            DEFAULT_DRIVER_DIR,
                                             "LIBVIRT_DRIVER_DIR")))
         return NULL;