In the current version of raylib, if you specify OPENGL_VERSION="ES 2.0" when compiling the DESKTOP version, the GL Context at runtime is set correctly by glfw, but the OpenGL ES2 header file is missing, so it cannot be compiled

This is a diff to make it possible to compile and work using glad's gles2.h

# build on Windows/Linux/OSX
cmake -DOPENGL_VERSION="ES 2.0" -B build
cmake --build build
cd build/examples
# windows
./Debug/raylib_opengl_interop.exe
# linux/mac
./raylib_opengl_interop

On environments that do not support the OpenGL ES2 context, copying and deploying libEGL.dll and libGLESv2.dll (libEGL.dylib, libGLESv2.dylib on Mac OS) from ANGLE (or Chrome, etc.) and it will be loaded by egl and work correctly