CMake: fixed compiler check algorithm (support of C++11)

CXX_STANDARD supported values are 98, 11, 14, 17 and 20.
- https://cmake.org/cmake/help/latest/prop_tgt/CXX_STANDARD.html

neo/CMakeLists.txt

@@ -116,18 +116,17 @@ if(CMAKE_COMPILER_IS_GNUCC OR CMAKE_C_COMPILER_ID STREQUAL "Clang")
 	#add_definitions(-Wall)
 	add_definitions(-Werror=format-security)
 	add_definitions(-Werror=format)
+
+	# Compiler check (needs -std=c++11 flag)
 	include(CheckCXXCompilerFlag)
 	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_STANDARD 11)
-	elseif(COMPILER_SUPPORTS_CXX0X)
-		set(CMAKE_CXX_STANDARD 0x)
+		set(CMAKE_CXX_STANDARD_REQUIRED ON)
+		set(CMAKE_CXX_EXTENSIONS OFF)
 	else()
 		message(FATAL_ERROR "The compiler ${CMAKE_CXX_COMPILER} has no C++11 support. Please use a different C++ compiler.")
 	endif()
-	set(CMAKE_CXX_STANDARD_REQUIRED ON)
-	set(CMAKE_CXX_EXTENSIONS OFF)
 
 	if(CPU_TYPE)
 		add_definitions(-DCPUSTRING="${CPU_TYPE}")

neo/idlib/sys/sys_defines.h

@@ -113,7 +113,7 @@ If you have questions concerning this license or the applicable additional terms
 			#define CPUSTRING						"e2k"
 		#elif defined(__aarch64__) || defined(__ARM64__) || defined(_M_ARM64)
 			#define CPUSTRING 						"aarch64"
-                #else
+		#else
 			#error unknown CPU
 		#endif
 	#endif