OSX/cmake: rollback ca5bbe0e cause OSX...

OSX/cmake: rollback ca5bbe0e cause OSX versions can have not subversion thus sw_vers -productVersion is not usable for sdk setting

CMakeLists.txt

@@ -307,11 +307,19 @@ if(APPLE)
 		FORCE)
 	endif()
 	
-	execute_process(COMMAND sw_vers -productVersion OUTPUT_VARIABLE MAC_SYS OUTPUT_STRIP_TRAILING_WHITESPACE) # check for actual system-version
-    if( ${MAC_SYS} VERSION_LESS 10.5)
-        set(OSX_SYSTEM unsupported)
+	execute_process(COMMAND uname -r OUTPUT_VARIABLE MAC_SYS) # check for actual system-version
+	if(${MAC_SYS} MATCHES 13)
+		set(OSX_SYSTEM 10.9)
+	elseif(${MAC_SYS} MATCHES 12)
+		set(OSX_SYSTEM 10.8)
+	elseif(${MAC_SYS} MATCHES 11)
+		set(OSX_SYSTEM 10.7)
+	elseif(${MAC_SYS} MATCHES 10)
+		set(OSX_SYSTEM 10.6)
+	elseif(${MAC_SYS} MATCHES 9)
+		set(OSX_SYSTEM 10.5)
 	else()
-        set(OSX_SYSTEM ${MAC_SYS})
+		set(OSX_SYSTEM unsupported)
 	endif()
 	message(STATUS "Detected system-version: " ${OSX_SYSTEM})