Clarify WSL error messages

CMakeLists.txt

@@ -9,7 +9,7 @@ if (CMAKE_SYSTEM_NAME STREQUAL "Linux")
     if(CMAKE_HOST_SYSTEM_VERSION MATCHES ".*[Mm]icrosoft.*" OR
         CMAKE_HOST_SYSTEM_VERSION MATCHES ".*WSL.*"
     )
-        message(FATAL_ERROR "This is not a supported environment for any purpose and should never be used.")
+        message(FATAL_ERROR "Building MultiMC is not supported in Linux-on-Windows distributions.")
     endif()
 endif()
 

application/MultiMC.cpp

@@ -158,8 +158,8 @@ MultiMC::MultiMC(int &argc, char **argv) : QApplication(argc, argv)
             ) {
                 showFatalErrorMessage(
                     "Unsupported system detected!",
-                    "It seems you are supporting the exploitation of Free Software.\n\n"
-                    "You smell bad and you should feel bad."
+                    "Linux-on-Windows distributions are not supported.\n\n"
+                    "Please use the Windows MultiMC binary when playing on Windows."
                 );
                 return;
             }