use built-in FindOpenGL module for GLES with cmake 3.23+

[mbaetgen-wup]

No description provided.

[kblaschke]

Probably needs to be done in the same way in the config package script here. I also always forget about this file, as seen in the 4.1.6 PR 😆

Guess you could also squash the changes into a single commit before merging, as it's only a few lines.

[kblaschke]

Please also add the version check conditional around the same line in the CMake package config file.

[kblaschke]

Just two small details left.

[kblaschke]

Checked CMake's sources to be sure and saw there that the GLES2 and GLES3 targets were actually added to CMake's find module in version 3.27 and not in v3.23 as I was expecting when I wrote the ReadMe in the module dir. So I think to be on the safe side, this should rather read:

Suggested change

	if (CMAKE_VERSION VERSION_LESS_EQUAL "3.22" OR CMAKE_SYSTEM_NAME STREQUAL Android)
	if (CMAKE_VERSION VERSION_LESS_EQUAL "3.26" OR CMAKE_SYSTEM_NAME STREQUAL Android)

Ditto in the package config file.

[kblaschke]

(If you want, you can update the ReadMe.md in cmake/gles accordingly.)

[kblaschke]

Better only temporarily append the current dir to the module path, like this:

Suggested change

	if (CMAKE_VERSION VERSION_LESS_EQUAL "3.22" OR CMAKE_SYSTEM_NAME STREQUAL Android)
	list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_LIST_DIR}")
	endif()
	find_dependency(OpenGL COMPONENTS GLES3)
	if (CMAKE_VERSION VERSION_LESS_EQUAL "3.22" OR CMAKE_SYSTEM_NAME STREQUAL Android)
	set(PROJECTM4_PREV_MODULE_PATH ${CMAKE_MODULE_PATH})
	list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_LIST_DIR}")
	find_dependency(OpenGL COMPONENTS GLES3)
	set(CMAKE_MODULE_PATH ${PROJECTM4_PREV_MODULE_PATH})
	else()
	find_dependency(OpenGL COMPONENTS GLES3)
	endif()

This will still allow the calling CMake project to override the find module, but will load projectM's module before the CMake-supplied one, and doesn't add unexpected paths to the module dir list.