Removed guard around the enabled assertions support code

Otherwise, SDL_assert_always() wouldn't work.

Fixes https://github.com/libsdl-org/SDL/issues/7433

include/SDL3/SDL_assert.h

@@ -134,8 +134,6 @@ typedef struct SDL_AssertData
     const struct SDL_AssertData *next;
 } SDL_AssertData;
 
-#if (SDL_ASSERT_LEVEL > 0)
-
 /**
  * Never call this directly.
  *
@@ -183,9 +181,7 @@ extern DECLSPEC SDL_AssertState SDLCALL SDL_ReportAssertion(SDL_AssertData *data
 #define SDL_enabled_assert(condition) \
     do { \
         while ( !(condition) ) { \
-            static struct SDL_AssertData sdl_assert_data = { \
-                0, 0, #condition, 0, 0, 0, 0 \
-            }; \
+            static struct SDL_AssertData sdl_assert_data = { 0, 0, #condition, 0, 0, 0, 0 }; \
             const SDL_AssertState sdl_assert_state = SDL_ReportAssertion(&sdl_assert_data, SDL_FUNCTION, SDL_FILE, SDL_LINE); \
             if (sdl_assert_state == SDL_ASSERTION_RETRY) { \
                 continue; /* go again. */ \
@@ -196,8 +192,6 @@ extern DECLSPEC SDL_AssertState SDLCALL SDL_ReportAssertion(SDL_AssertData *data
         } \
     } while (SDL_NULL_WHILE_LOOP_CONDITION)
 
-#endif  /* enabled assertions support code */
-
 /* Enable various levels of assertions. */
 #if SDL_ASSERT_LEVEL == 0   /* assertions disabled */
 #   define SDL_assert(condition) SDL_disabled_assert(condition)