[CMake] Add WSL2 support

Adds WSL2 detection support to CMake builds. WSL2 comes with WSLg by default, allowing users to run linux GUI applications (X11/Wayland) natively without needing a separate XWindow server.

Author: Fuzzbawls

CMakeLists.txt

@@ -61,13 +61,17 @@ if(${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
 elseif(${CMAKE_SYSTEM_NAME} MATCHES "Linux")
     set(ENV{target} "Linux")
     file(READ "/proc/version" _SYS_VERSION)
-    string(REGEX MATCH "Microsoft" _SYSTEM_VERSION_PARSED "${_SYS_VERSION}")
+    string(REGEX MATCH "[M|m]icrosoft" _SYSTEM_VERSION_PARSED "${_SYS_VERSION}")
     if(${_SYSTEM_VERSION_PARSED} MATCHES "Microsoft")
         message(STATUS "Compiling on WSL")
         set(ENV{DISPLAY} ":0")
         set(ENV{LIBGL_ALWAYS_INDIRECT} 1)
         set(CMAKE_RUNTIME_OUTPUT_DIRECTORY /home/$ENV{USER}/pivx-run)
         message(WARNING "WSL Runtime support requires VcXsrv to be installed and running")
+    elseif(${_SYSTEM_VERSION_PARSED} MATCHES "microsoft")
+        message(STATUS "Compiling on WSL2")
+        message(STATUS "WSL2 Runtime support requires a WSLg compatible system")
+        set(CMAKE_RUNTIME_OUTPUT_DIRECTORY /home/$ENV{USER}/pivx-run)
     else()
         message(STATUS "Compiling on Linux")
     endif()