gallium/drivers: Add extern "C" wrappers to public entry

Reviewed-by: Brian Paul <brianp@vmware.com>

src/gallium/drivers/llvmpipe/lp_public.h

@@ -1,10 +1,18 @@
 #ifndef LP_PUBLIC_H
 #define LP_PUBLIC_H
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 struct pipe_screen;
 struct sw_winsys;
 
 struct pipe_screen *
 llvmpipe_create_screen(struct sw_winsys *winsys);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif

src/gallium/drivers/rbug/rbug_public.h

@@ -28,6 +28,10 @@
 #ifndef RBUG_PUBLIC_H
 #define RBUG_PUBLIC_H
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 struct pipe_screen;
 struct pipe_context;
 
@@ -37,4 +41,8 @@ rbug_screen_create(struct pipe_screen *screen);
 boolean
 rbug_enabled(void);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* RBUG_PUBLIC_H */

src/gallium/drivers/softpipe/sp_public.h

@@ -1,10 +1,18 @@
 #ifndef SP_PUBLIC_H
 #define SP_PUBLIC_H
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 struct pipe_screen;
 struct sw_winsys;
 
 struct pipe_screen *
 softpipe_create_screen(struct sw_winsys *winsys);
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif