mapi: remove needless c99_compat.h includes

Reviewed-by: Jesse Natalie <jenatali@microsoft.com>
Reviewed-by: Alyssa Rosenzweig <alyssa@collabora.com>
Reviewed-by: Eric Engestrom <eric@engestrom.ch>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/16812>

src/mapi/table.h

@@ -28,7 +28,6 @@
 #ifndef _TABLE_H_
 #define _TABLE_H_
 
-#include "c99_compat.h"
 #include "entry.h"
 
 #define MAPI_TMP_TABLE

src/mapi/u_current.h

@@ -1,7 +1,6 @@
 #ifndef _U_CURRENT_H_
 #define _U_CURRENT_H_
 
-#include "c99_compat.h"
 #include "util/macros.h"
 
 

src/mapi/u_execmem.c

@@ -32,7 +32,6 @@
  */
 
 
-#include "c99_compat.h"
 #include "c11/threads.h"
 #include "u_execmem.h"