cmake: fix Nintendo Switch support

cmake/nxtoolchain/CheckNXFunctions.cmake

@@ -1,7 +0,0 @@
-if(NOT COMMAND nx_generate_nacp)
-    message(FATAL_ERROR "The `nx_generate_nacp` cmake command is not available. Please use an appropriate Nintendo Switch toolchain.")
-endif()
-
-if(NOT COMMAND nx_create_nro)
-    message(FATAL_ERROR "The `nx_create_nro` cmake command is not available. Please use an appropriate Nintendo Switch toolchain.")
-endif()

cmake/nxtoolchain/NXFunctions.cmake

@@ -0,0 +1,32 @@
+if(NOT COMMAND nx_generate_nacp)
+    message(FATAL_ERROR "The `nx_generate_nacp` cmake command is not available. Please use an appropriate Nintendo Switch toolchain.")
+endif()
+
+if(NOT COMMAND nx_create_nro)
+    message(FATAL_ERROR "The `nx_create_nro` cmake command is not available. Please use an appropriate Nintendo Switch toolchain.")
+endif()
+
+set(CMAKE_EXECUTABLE_SUFFIX ".elf")
+
+function(librw_platform_target TARGET)
+    cmake_parse_arguments(LPT "INSTALL" "" "" ${ARGN})
+
+    get_target_property(TARGET_TYPE "${TARGET}" TYPE)
+    if(TARGET_TYPE STREQUAL "EXECUTABLE")
+        nx_generate_nacp(${TARGET}.nacp
+            NAME "${TARGET}"
+            AUTHOR "${librw_AUTHOR}"
+            VERSION "${librw_VERSION}"
+        )
+
+        nx_create_nro(${TARGET}
+            NACP ${TARGET}.nacp
+        )
+
+        if(LIBRW_INSTALL AND LPT_INSTALL)
+            install(FILES "${CMAKE_CURRENT_BINARY_DIR}/${TARGET}.nro"
+                DESTINATION "${CMAKE_INSTALL_BINDIR}"
+            )
+        endif()
+    endif()
+endfunction()