cmake: update for compatibility with CMake 4.0

CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.13)
+cmake_minimum_required(VERSION 4.0)
 project(mango C ASM)
 
 if (NOT BUILD_TOOLS_DIR)
@@ -28,8 +28,6 @@ file(GLOB_RECURSE arch_sources_c arch/${kernel_arch}/*.c)
 file(GLOB_RECURSE arch_sources_asm arch/${kernel_arch}/*.S)
 file(GLOB_RECURSE arch_headers arch/${kernel_arch}/*.h)
 
-set_property(SOURCE ${arch_sources_asm} PROPERTY LANGUAGE C)
-
 add_executable(${kernel_exe_name}
 	${kernel_sources}
 	${kernel_headers}

libmango/CMakeLists.txt

@@ -1,7 +1,6 @@
 file(GLOB headers ${CMAKE_CURRENT_SOURCE_DIR}/include/mango/*.h)
 file(GLOB asm_sources
 	${CMAKE_CURRENT_SOURCE_DIR}/arch/${CMAKE_SYSTEM_PROCESSOR}/*.S)
-set_property(SOURCE ${asm_sources} PROPERTY LANGUAGE C)
 
 set(public_include_dirs
 	${CMAKE_CURRENT_SOURCE_DIR}/include