haiku: fix Mesa build

1. The hgl.c file is a read-only file versus read-write.
Ref: src/gallium/state_trackers/hgl/hgl.c

2.  I've included the Haiku-specific patches I used to get a successful
build of Mesa 19.1.7 on Haiku using the meson/ninja build procedure.
Shows "[764/764] linking target ... libswpipe.so" at build completion.

v2:
Remove autotools files (Eric)

v3:
Update the patch

Reported-by: Ken Mays <[email protected]>
Tested-by: Ken Mays <[email protected]>
CC: [email protected]
Reviewed-by: Alexander von Gluck IV <[email protected]>

1 files changed, 4 insertions, 0 deletions

diff --git a/src/gallium/state_trackers/hgl/hgl_context.h b/src/gallium/state_trackers/hgl/hgl_context.h
index 5acb2f08db1..c5995f1cd2b 100644
--- a/src/gallium/state_trackers/hgl/hgl_context.h
+++ b/src/gallium/state_trackers/hgl/hgl_context.h
@@ -39,6 +39,8 @@ struct hgl_buffer
 	unsigned mask;
 
 	struct pipe_screen* screen;
+	struct pipe_surface* surface;
+
 	enum pipe_texture_target target;
 	struct pipe_resource* textures[ST_ATTACHMENT_COUNT];
 
@@ -80,6 +82,8 @@ struct hgl_context
 	struct hgl_buffer* read;
 };
 
+// hgl_buffer from statetracker interface
+struct hgl_buffer* hgl_st_framebuffer(struct st_framebuffer_iface *stfbi);
 
 // hgl state_tracker api
 struct st_api* hgl_create_st_api(void);