Enable LTO if available

cmake/platforms/emscripten.cmake

@@ -15,6 +15,9 @@ set(USE_OPENAL_DLOPEN OFF CACHE INTERNAL "")
 set(BUILD_GAME_LIBRARIES OFF CACHE INTERNAL "")
 set(USE_HTTP OFF CACHE INTERNAL "")
 
+# Disable LTO since the libraries Emscripten provides aren't LTO enabled
+set(CMAKE_INTERPROCEDURAL_OPTIMIZATION FALSE)
+
 list(APPEND CLIENT_LINK_OPTIONS
     -sTOTAL_MEMORY=256MB
     -sSTACK_SIZE=5MB