fix(eui-neo): bridge platform header for generated TU

Author: FarnaHerry

pkgs/e/compat.eui-neo.lua

@@ -137,7 +137,7 @@ package = {
         -- `*/include` carries the umbrella `eui_neo.h` and `eui/*.h`; `*` is the
         -- verdir root, which is what makes the `"components/…"`, `"core/…"` and
         -- `"3rd/stb_image.h"` quoted includes resolve. Upstream marks both PUBLIC.
-        include_dirs = { "*/include", "*", "mcpp_generated" },
+        include_dirs = { "*/include", "*", "mcpp_generated", "mcpp_generated/.." },
 
         -- mcpp#233/#240: every package in a link emits its objects into ONE
         -- flat obj/ dir keyed by source basename. Upstream's
@@ -171,6 +171,10 @@ package = {
 #if defined(MCPP_FEATURE_SDL2)
 #  define EUI_WINDOW_BACKEND_SDL2 1
 #endif
+]==],
+            ["mcpp_generated/core/platform/platform.h"] = [==[
+/* Forward the upstream quoted include through the generated include root. */
+#include "../../../core/platform/platform.h"
 ]==],
             ["mcpp_generated/eui_neo_platform_tu.cpp"] = [==[
 /* Uniquely named forwarding TU — see the mcpp#233 note in the descriptor. */