st/mesa: Clean up header file inclusion in st_program.h.

st_program.h
Remove p_shader_tokens.h
Include st_context.h for st_context symbol.
Include p_state.h for PIPE_MAX_SHADER_INPUTS symbol.
Remove unnecessary forward declarations.

st_cb_bitmap.c
st_cb_clear.c
Include p_shader_tokens.h now that st_program.h doesn't include it.

src/mesa/state_tracker/st_cb_bitmap.c

@@ -46,6 +46,7 @@
 
 #include "pipe/p_context.h"
 #include "pipe/p_defines.h"
+#include "pipe/p_shader_tokens.h"
 #include "util/u_inlines.h"
 #include "util/u_draw_quad.h"
 #include "util/u_simple_shaders.h"

src/mesa/state_tracker/st_cb_clear.c

@@ -45,6 +45,7 @@
 #include "st_program.h"
 
 #include "pipe/p_context.h"
+#include "pipe/p_shader_tokens.h"
 #include "pipe/p_state.h"
 #include "pipe/p_defines.h"
 #include "util/u_format.h"

src/mesa/state_tracker/st_program.h

@@ -36,11 +36,8 @@
 
 #include "main/mtypes.h"
 #include "program/program.h"
-#include "pipe/p_shader_tokens.h"
-
-
-struct cso_fragment_shader;
-struct cso_vertex_shader;
+#include "pipe/p_state.h"
+#include "st_context.h"
 
 
 /**