gallium: remove unused function declarations

Unused as of commit 23fb11455b "{st,targets}/dri: use static/dynamic
pipe-loader"

Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
Reviewed-by: Ilia Mirkin <imirkin@alum.mit.edu>

src/gallium/include/state_tracker/drisw_api.h

@@ -20,9 +20,4 @@ struct drisw_loader_funcs
                        void *data, int x, int y, unsigned width, unsigned height, unsigned stride);
 };
 
-/**
- * Implemented by the drisw target.
- */
-struct pipe_screen * drisw_create_screen(struct drisw_loader_funcs *lf);
-
 #endif

src/gallium/state_trackers/dri/dri_screen.h

@@ -147,7 +147,6 @@ dri_destroy_screen_helper(struct dri_screen * screen);
 void
 dri_destroy_screen(__DRIscreen * sPriv);
 
-extern struct pipe_screen *kms_swrast_create_screen(int fd);
 extern const struct __DriverAPIRec dri_kms_driver_api;
 
 extern const struct __DriverAPIRec galliumdrm_driver_api;