CMakeLists: update min version to 3.22 for CMake >= 4.0 support

Update minimum version of CMake to 3.22 for CMake >= 4.0 version
support.

New CMake require 3.5 as the minimum version with that increased to 3.10
in the next CMake release.

Drop old redundant CMake condition not needed anymore due to new version
requirement.

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>

Author: Ansuel

CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required (VERSION 2.8.11)
+cmake_minimum_required (VERSION 3.22)
 project (upm)
 
 # Before going any further, define build options
@@ -260,37 +260,14 @@ set (upm_VERSION_STRING ${upm_VERSION_MAJOR}.${upm_VERSION_MINOR}.${upm_VERSION_
 
 # enable c++11 standards support unconditionally
 include(CheckCXXCompilerFlag)
-if (CMAKE_VERSION VERSION_LESS "3.1")
-  CHECK_CXX_COMPILER_FLAG("-std=c++11" COMPILER_SUPPORTS_CXX11)
-  CHECK_CXX_COMPILER_FLAG("-std=c++0x" COMPILER_SUPPORTS_CXX0X)
-  if (COMPILER_SUPPORTS_CXX11)
-    set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
-  elseif (COMPILER_SUPPORTS_CXX0X)
-    set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++0x")
-  else()
-    message(FATAL_ERROR "A C++11 compliant compiler is required to build UPM.")
-  endif()
-else()
-  # 3.1+ uses this generic method to enable c++11
-  set (CMAKE_CXX_STANDARD 11)
-  set (CXX_STANDARD_REQUIRED ON)
-  set (CXX_EXTENSIONS OFF)
-endif()
+set (CMAKE_CXX_STANDARD 11)
+set (CXX_STANDARD_REQUIRED ON)
+set (CXX_EXTENSIONS OFF)
 
 include(CheckCCompilerFlag)
-if (CMAKE_VERSION VERSION_LESS "3.1")
-  CHECK_C_COMPILER_FLAG("-std=c11" COMPILER_SUPPORTS_C11)
-  if (COMPILER_SUPPORTS_C11)
-    set (CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -std=c11")
-  else()
-    message(FATAL_ERROR "A C11 compliant C compiler is required to build UPM.")
-  endif()
-else()
-  # 3.1+ uses this generic method to enable c11
-  set (CMAKE_C_STANDARD 11)
-  set (C_STANDARD_REQUIRED ON)
-  set (C_EXTENSIONS OFF)
-endif()
+set (CMAKE_C_STANDARD 11)
+set (C_STANDARD_REQUIRED ON)
+set (C_EXTENSIONS OFF)
 
 # The doc target depends on the C/C++ source and all libraries
 #