i965: remove includes of sampler.h from extern "C" blocks

C linkage was removed from functions in program/sampler.cpp.  However,
some cpp files include program/sampler.h within extern "C" blocks,
causing link errors for test_vec4_copy_propagation.

Reviewed-by: Brian Paul <brianp@vmware.com>
Tested-by: Ian Romanick <ian.d.romanick@intel.com>

src/mesa/drivers/dri/i965/brw_fs.cpp

@@ -39,7 +39,6 @@ extern "C" {
 #include "program/prog_parameter.h"
 #include "program/prog_print.h"
 #include "util/register_allocate.h"
-#include "program/sampler.h"
 #include "program/hash_table.h"
 #include "brw_context.h"
 #include "brw_eu.h"
@@ -51,6 +50,7 @@ extern "C" {
 #include "main/uniforms.h"
 #include "brw_fs_live_variables.h"
 #include "glsl/glsl_types.h"
+#include "program/sampler.h"
 
 void
 fs_inst::init(enum opcode opcode, uint8_t exec_size, const fs_reg &dst,

src/mesa/drivers/dri/i965/brw_fs.h

@@ -40,7 +40,6 @@ extern "C" {
 #include "program/prog_print.h"
 #include "program/prog_optimize.h"
 #include "util/register_allocate.h"
-#include "program/sampler.h"
 #include "program/hash_table.h"
 #include "brw_context.h"
 #include "brw_eu.h"
@@ -50,6 +49,7 @@ extern "C" {
 }
 #include "glsl/glsl_types.h"
 #include "glsl/ir.h"
+#include "program/sampler.h"
 
 #define MAX_SAMPLER_MESSAGE_SIZE 11
 #define MAX_VGRF_SIZE 16

src/mesa/drivers/dri/i965/brw_fs_visitor.cpp

@@ -37,7 +37,6 @@ extern "C" {
 #include "program/prog_print.h"
 #include "program/prog_optimize.h"
 #include "util/register_allocate.h"
-#include "program/sampler.h"
 #include "program/hash_table.h"
 #include "brw_context.h"
 #include "brw_eu.h"
@@ -48,6 +47,8 @@ extern "C" {
 #include "main/uniforms.h"
 #include "glsl/glsl_types.h"
 #include "glsl/ir_optimization.h"
+#include "program/sampler.h"
+
 
 fs_reg *
 fs_visitor::emit_vs_system_value(enum brw_reg_type type, int location)

src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp

@@ -24,9 +24,7 @@
 #include "brw_vec4.h"
 #include "brw_cfg.h"
 #include "glsl/ir_uniform.h"
-extern "C" {
 #include "program/sampler.h"
-}
 
 namespace brw {