gallium: do not #include foo.h within extern C {}

Analogous to previous commit.

Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>
Reviewed-by: Brian Paul <brianp@vmware.com>

src/gallium/auxiliary/tgsi/tgsi_util.h

@@ -28,12 +28,12 @@
 #ifndef TGSI_UTIL_H
 #define TGSI_UTIL_H
 
+#include "pipe/p_shader_tokens.h"
+
 #if defined __cplusplus
 extern "C" {
 #endif
 
-#include "pipe/p_shader_tokens.h"
-
 struct tgsi_src_register;
 struct tgsi_full_src_register;
 struct tgsi_full_instruction;