use newer version of raygui

.gitmodules

@@ -1,3 +1,6 @@
 [submodule "3rdparty/raylib"]
 	path = 3rdparty/raylib
 	url = https://github.com/raysan5/raylib
+[submodule "3rdparty/raygui"]
+	path = 3rdparty/raygui
+	url = https://github.com/raysan5/raygui.git

3rdparty/raygui

@@ -0,0 +1 @@
+Subproject commit f08ec1d08a65fd5ab607c93f413e1742219a582e

build.zig

@@ -18,6 +18,7 @@ pub fn build(b: *std.build.Builder) void {
     const ray = raylib.addRaylib(b, exe.target);
     exe.linkLibrary(ray);
     exe.addIncludeDir("./3rdparty/raylib/src");
+    exe.addIncludeDir("./3rdparty/raygui/src");
 
     exe.setBuildMode(mode);
     exe.install();

src/main.zig

@@ -4,7 +4,7 @@ const ray = @cImport({
 });
 const raygui = @cImport({
     @cDefine("RAYGUI_IMPLEMENTATION", {});
-    @cInclude("extras/raygui.h");
+    @cInclude("raygui.h");
 });
 
 pub fn main() anyerror!void {