Move the VIR_DRV_FEATURE* constants

Move the VIR_DRV_FEATURE* constants into libvirt_internal.h
since these flags are indicating whether  APIs in the
libvirt_internal.h file are supported by a driver

* src/driver.h: Remove VIR_DRV_FEATURE* constants
* src/libvirt_internal.h: Add VIR_DRV_FEATURE* constants, using
  an enum instead of #define
* src/internal.h: pull in libvirt_internal.h

src/driver.h

@@ -44,25 +44,6 @@ typedef enum {
     VIR_DRV_OPEN_ERROR = -2,
 } virDrvOpenStatus;
 
-/* Feature detection.  This is a libvirt-private interface for determining
- * what features are supported by the driver.
- *
- * The remote driver passes features through to the real driver at the
- * remote end unmodified, except if you query a VIR_DRV_FEATURE_REMOTE*
- * feature.
- */
-    /* Driver supports V1-style virDomainMigrate, ie. domainMigratePrepare/
-     * domainMigratePerform/domainMigrateFinish.
-     */
-#define VIR_DRV_FEATURE_MIGRATION_V1 1
-
-    /* Driver is not local. */
-#define VIR_DRV_FEATURE_REMOTE 2
-
-    /* Driver supports V2-style virDomainMigrate, ie. domainMigratePrepare2/
-     * domainMigratePerform/domainMigrateFinish2.
-     */
-#define VIR_DRV_FEATURE_MIGRATION_V2 3
 
 /* Internal feature-detection macro.  Don't call drv->supports_feature
  * directly, because it may be NULL, use this macro instead.

src/internal.h

@@ -24,6 +24,8 @@
 #include "libvirt/libvirt.h"
 #include "libvirt/virterror.h"
 
+#include "libvirt_internal.h"
+
 /* On architectures which lack these limits, define them (ie. Cygwin).
  * Note that the libvirt code should be robust enough to handle the
  * case where actual value is longer than these limits (eg. by setting

src/libvirt_internal.h

@@ -17,6 +17,9 @@
  * License along with this library; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA
  *
+ * NB This file is ABI sensitive. Things here impact the wire
+ * protocol ABI in the remote driver. Same rules as for things
+ * include/libvirt/libvirt.h apply. ie this file is *append* only
  */
 
 #ifndef __LIBVIRT_H_
@@ -31,6 +34,30 @@ int virStateReload(void);
 int virStateActive(void);
 #endif
 
+/* Feature detection.  This is a libvirt-private interface for determining
+ * what features are supported by the driver.
+ *
+ * The remote driver passes features through to the real driver at the
+ * remote end unmodified, except if you query a VIR_DRV_FEATURE_REMOTE*
+ * feature.
+ *
+ */
+enum {
+    /* Driver supports V1-style virDomainMigrate, ie. domainMigratePrepare/
+     * domainMigratePerform/domainMigrateFinish.
+     */
+    VIR_DRV_FEATURE_MIGRATION_V1 = 1,
+
+    /* Driver is not local. */
+    VIR_DRV_FEATURE_REMOTE = 2,
+
+    /* Driver supports V2-style virDomainMigrate, ie. domainMigratePrepare2/
+     * domainMigratePerform/domainMigrateFinish2.
+     */
+    VIR_DRV_FEATURE_MIGRATION_V2 = 3,
+};
+
+
 int virDrvSupportsFeature (virConnectPtr conn, int feature);
 
 int virDomainMigratePrepare (virConnectPtr dconn,