Fix compilation for -DPLATFORM=RGFW (#5870)

When compiling with
cmake -S . -B build-desktop-rgfw -DPLATFORM=RGFW -DCMAKE_BUILD_TYPE=Release
cmake --build build-desktop-rgfw

these errors appeared:
raylib/examples/others/raylib_opengl_interop.c💯5: error: unknown type name ‘GLuint’
  100 |     GLuint vao = 0;
[etc]

build.zig

@@ -739,7 +739,6 @@ fn addExamples(
                 .root_module = exe_mod,
                 .use_lld = target.result.os.tag == .windows,
             });
-            b.installArtifact(exe);
 
             const install_cmd = b.addInstallArtifact(exe, .{ .dest_sub_path = b.fmt("{s}/{s}", .{ module, filename }) });
 

examples/others/raylib_opengl_interop.c

@@ -28,7 +28,7 @@
 
 #include "raylib.h"
 
-#if defined(PLATFORM_DESKTOP) || defined(PLATFORM_DESKTOP_SDL)
+#if defined(PLATFORM_DESKTOP) || defined(PLATFORM_DESKTOP_SDL) || defined(PLATFORM_DESKTOP_RGFW)
     #if defined(GRAPHICS_API_OPENGL_ES2)
         #include "glad_gles2.h"       // Required for: OpenGL functionality
         #define glGenVertexArrays glGenVertexArraysOES