Fixed some defaults in CMake project file.

Fixes not finding dlopen(), etc.

CMakeLists.txt

@@ -213,6 +213,14 @@ if(EMSCRIPTEN)
   set(SDL_LOADSO_ENABLED_BY_DEFAULT OFF)
   set(SDL_CPUINFO_ENABLED_BY_DEFAULT OFF)
   set(DLOPEN_ENABLED_BY_DEFAULT OFF)
+else()
+  set(OPT_DEF_ASM TRUE)
+  set(SDL_SHARED_ENABLED_BY_DEFAULT ON)
+  set(SDL_ATOMIC_ENABLED_BY_DEFAULT ON)
+  set(SDL_THREADS_ENABLED_BY_DEFAULT ON)
+  set(SDL_LOADSO_ENABLED_BY_DEFAULT ON)
+  set(SDL_CPUINFO_ENABLED_BY_DEFAULT ON)
+  set(DLOPEN_ENABLED_BY_DEFAULT ON)
 endif()
 
 set(SDL_SUBSYSTEMS