egl: replace MESA_EGL_NO_X11_HEADERS hack with upstream EGL_NO_X11

Signed-off-by: Eric Engestrom <eric.engestrom@intel.com>
Reviewed-by: Daniel Stone <daniels@collabora.com>
diff --git a/include/EGL/eglplatform.h b/include/EGL/eglplatform.h
index 4876dbd..939539e 100644
--- a/include/EGL/eglplatform.h
+++ b/include/EGL/eglplatform.h
@@ -55,6 +55,12 @@
 #endif
 #define EGLAPIENTRYP EGLAPIENTRY*
 
+#if defined(MESA_EGL_NO_X11_HEADERS) && !defined(EGL_NO_X11)
+#warning "`MESA_EGL_NO_X11_HEADERS` is deprecated, and doesn't work with the unmodified Khronos header"
+#warning "Please use `EGL_NO_X11` instead, as `MESA_EGL_NO_X11_HEADERS` will be removed soon"
+#define EGL_NO_X11
+#endif
+
 /* The types NativeDisplayType, NativeWindowType, and NativePixmapType
  * are aliases of window-system-dependent types, such as X Display * or
  * Windows Device Context. They must be defined in platform-specific
@@ -116,15 +122,13 @@
 typedef intptr_t EGLNativePixmapType;
 typedef intptr_t EGLNativeWindowType;
 
-#elif defined(__unix__) || defined(__APPLE__)
+#elif defined(__unix__) && defined(EGL_NO_X11)
 
-#if defined(MESA_EGL_NO_X11_HEADERS)
-
-typedef void            *EGLNativeDisplayType;
+typedef void             *EGLNativeDisplayType;
 typedef khronos_uintptr_t EGLNativePixmapType;
 typedef khronos_uintptr_t EGLNativeWindowType;
 
-#else
+#elif defined(__unix__) || defined(USE_X11)
 
 /* X11 (tentative)  */
 #include <X11/Xlib.h>
@@ -134,7 +138,11 @@
 typedef Pixmap   EGLNativePixmapType;
 typedef Window   EGLNativeWindowType;
 
-#endif /* MESA_EGL_NO_X11_HEADERS */
+#elif defined(__APPLE__)
+
+typedef int   EGLNativeDisplayType;
+typedef void *EGLNativePixmapType;
+typedef void *EGLNativeWindowType;
 
 #elif defined(__HAIKU__)
 
diff --git a/meson.build b/meson.build
index bce17a7..1c14f4d 100644
--- a/meson.build
+++ b/meson.build
@@ -761,8 +761,8 @@
     endif
   endif
 else
-  pre_args += '-DMESA_EGL_NO_X11_HEADERS'
-  gl_pkgconfig_c_flags += '-DMESA_EGL_NO_X11_HEADERS'
+  pre_args += '-DEGL_NO_X11'
+  gl_pkgconfig_c_flags += '-DEGL_NO_X11'
 endif
 if with_platform_drm
   if with_egl and not with_gbm