Add build option for opengl profile (#592)

* Add opengl_profile build option

on android the option is set to OpenGLES by default

* Replace android checks with using_gles

src/core/renderer_gl/renderer_gl.cpp

@@ -49,7 +49,7 @@ void RendererGL::reset() {
 		gl.useProgram(oldProgram);  // Switch to old GL program
 	}
 
-#ifdef __ANDROID__
+#ifdef USING_GLES
 	fragShaderGen.setTarget(PICA::ShaderGen::API::GLES, PICA::ShaderGen::Language::GLSL);
 #endif
 }

src/hydra_core.cpp

@@ -114,7 +114,7 @@ hydra::Size HydraCore::getNativeSize() { return {400, 480}; }
 void HydraCore::setOutputSize(hydra::Size size) {}
 
 void HydraCore::resetContext() {
-#ifdef __ANDROID__
+#ifdef USING_GLES
 	if (!gladLoadGLES2Loader(reinterpret_cast<GLADloadproc>(getProcAddress))) {
 		Helpers::panic("OpenGL ES init failed");
 	}