Android build via CMake (#13528)

* the thing

* the thing 2

CMakeLists.txt

@@ -67,9 +67,17 @@ set(ENABLE_UPDATE_CHECKER (NOT ${DEVELOPMENT_BUILD}) CACHE BOOL
 # Included stuff
 set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_SOURCE_DIR}/cmake/Modules/")
 
+# Load default options for Android
+if(ANDROID)
+	cmake_minimum_required(VERSION 3.20)
+	include(MinetestAndroidLibs)
+endif()
+
 
 set(IRRLICHTMT_BUILD_DIR "" CACHE PATH "Path to IrrlichtMt build directory.")
-if(NOT "${IRRLICHTMT_BUILD_DIR}" STREQUAL "")
+if(ANDROID)
+	# currently manually provided
+elseif(NOT "${IRRLICHTMT_BUILD_DIR}" STREQUAL "")
 	find_package(IrrlichtMt QUIET
 		PATHS "${IRRLICHTMT_BUILD_DIR}"
 		NO_DEFAULT_PATH
@@ -120,7 +128,9 @@ else()
 	endif()
 endif()
 
-if(BUILD_CLIENT AND TARGET IrrlichtMt::IrrlichtMt)
+if(ANDROID)
+	# skipped for now
+elseif(BUILD_CLIENT AND TARGET IrrlichtMt::IrrlichtMt)
 	# retrieve version somehow
 	if(NOT IrrlichtMt_VERSION)
 		get_target_property(IrrlichtMt_VERSION IrrlichtMt VERSION)