Fix SDL_LEAN_AND_MEAN logic

[Lzard]

Currently, config flag macros depending on SDL_LEAN_AND_MEAN are always defined, regardless of its value, and only their definedness is checked, not their own values. Those changes fixes this.

See 387774a
Fixes #11344

---

While looking for other issues similar to this, I noticed:

• Some config flag macros are conditionally defined, but may still not be true, e.g.:

  SDL/include/SDL3/SDL_platform_defines.h

  Lines 363 to 374 in 8026866

  	#if HAVE_WINAPIFAMILY_H
  	#include <winapifamily.h>
  	#define WINAPI_FAMILY_WINRT (!WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP) && WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_APP))
  	#else
  	#define WINAPI_FAMILY_WINRT 0
  	#endif /* HAVE_WINAPIFAMILY_H */
  	#if HAVE_WINAPIFAMILY_H && HAVE_WINAPIFAMILY_H
  	#define SDL_WINAPI_FAMILY_PHONE (WINAPI_FAMILY == WINAPI_FAMILY_PHONE_APP)
  	#else
  	#define SDL_WINAPI_FAMILY_PHONE 0
  	#endif

• Third-parties sometimes always define the config flag, but either as true or false, e.g. the OpenGL/Vulkan headers, or even compiler flags:

  SDL/include/SDL3/SDL_platform_defines.h

  Lines 165 to 186 in 8026866

  	/* Fix building with older SDKs that don't define these
  	See this for more information:
  	https://stackoverflow.com/questions/12132933/preprocessor-macro-for-os-x-targets
  	*/
  	#ifndef TARGET_OS_MACCATALYST
  	#define TARGET_OS_MACCATALYST 0
  	#endif
  	#ifndef TARGET_OS_IOS
  	#define TARGET_OS_IOS 0
  	#endif
  	#ifndef TARGET_OS_IPHONE
  	#define TARGET_OS_IPHONE 0
  	#endif
  	#ifndef TARGET_OS_TV
  	#define TARGET_OS_TV 0
  	#endif
  	#ifndef TARGET_OS_SIMULATOR
  	#define TARGET_OS_SIMULATOR 0
  	#endif
  	#ifndef TARGET_OS_VISION
  	#define TARGET_OS_VISION 0
  	#endif

It might be better to always check that config flag macros are defined and true.

[rollerozxa]

Tested PR when building for Linux as well as for Windows (cross-compiling with llvm-mingw), works and fixes the issue.

On main, with an SDL3 static library built with SDL_LEAN_AND_MEAN=1, the optimised blitters, RLE accelerated surfaces and YUV are disabled as they should be (their respective object files resemble stubs 396 bytes in size in the .a file), but the software renderer is not:

/tmp/sdl/build >>> ar tv libSDL3.a | grep '396'                                                                                
rw-r--r-- 0/0    396 Jan  1 01:00 1970 SDL_audiodev.c.obj
rw-r--r-- 0/0    396 Jan  1 01:00 1970 imKStoUCS.c.obj
rw-r--r-- 0/0    396 Jan  1 01:00 1970 SDL_runapp.c.obj
rw-r--r-- 0/0    396 Jan  1 01:00 1970 SDL_yuv_sw.c.obj
rw-r--r-- 0/0    396 Jan  1 01:00 1970 SDL_render_ps2.c.obj
rw-r--r-- 0/0    396 Jan  1 01:00 1970 SDL_render_psp.c.obj
rw-r--r-- 0/0    396 Jan  1 01:00 1970 SDL_mslibc.c.obj
rw-r--r-- 0/0    396 Jan  1 01:00 1970 SDL_RLEaccel.c.obj
rw-r--r-- 0/0    396 Jan  1 01:00 1970 SDL_blit_0.c.obj
rw-r--r-- 0/0    396 Jan  1 01:00 1970 SDL_blit_1.c.obj
rw-r--r-- 0/0    396 Jan  1 01:00 1970 SDL_blit_A.c.obj
rw-r--r-- 0/0    396 Jan  1 01:00 1970 SDL_blit_N.c.obj
rw-r--r-- 0/0    396 Jan  1 01:00 1970 SDL_blit_auto.c.obj
rw-r--r-- 0/0    396 Jan  1 01:00 1970 yuv_rgb_lsx.c.obj
rw-r--r-- 0/0    396 Jan  1 01:00 1970 yuv_rgb_sse.c.obj
rw-r--r-- 0/0    396 Jan  1 01:00 1970 yuv_rgb_std.c.obj
rw-r--r-- 0/0    396 Jan  1 01:00 1970 pch.c.obj

With this PR all beforementioned remain disabled, and the software renderer and associated object files are disabled too.

/tmp/sdl/build >>> ar tv libSDL3.a | grep '396'                                                                                
rw-r--r-- 0/0    396 Jan  1 01:00 1970 SDL_audiodev.c.obj
rw-r--r-- 0/0    396 Jan  1 01:00 1970 imKStoUCS.c.obj
rw-r--r-- 0/0    396 Jan  1 01:00 1970 SDL_runapp.c.obj
rw-r--r-- 0/0    396 Jan  1 01:00 1970 SDL_yuv_sw.c.obj
rw-r--r-- 0/0    396 Jan  1 01:00 1970 SDL_render_ps2.c.obj
rw-r--r-- 0/0    396 Jan  1 01:00 1970 SDL_render_psp.c.obj
rw-r--r-- 0/0    396 Jan  1 01:00 1970 SDL_blendline.c.obj
rw-r--r-- 0/0    396 Jan  1 01:00 1970 SDL_blendpoint.c.obj
rw-r--r-- 0/0    396 Jan  1 01:00 1970 SDL_drawline.c.obj
rw-r--r-- 0/0    396 Jan  1 01:00 1970 SDL_drawpoint.c.obj
rw-r--r-- 0/0    396 Jan  1 01:00 1970 SDL_render_sw.c.obj
rw-r--r-- 0/0    396 Jan  1 01:00 1970 SDL_rotate.c.obj
rw-r--r-- 0/0    396 Jan  1 01:00 1970 SDL_triangle.c.obj
rw-r--r-- 0/0    396 Jan  1 01:00 1970 SDL_mslibc.c.obj
rw-r--r-- 0/0    396 Jan  1 01:00 1970 SDL_RLEaccel.c.obj
rw-r--r-- 0/0    396 Jan  1 01:00 1970 SDL_blit_0.c.obj
rw-r--r-- 0/0    396 Jan  1 01:00 1970 SDL_blit_1.c.obj
rw-r--r-- 0/0    396 Jan  1 01:00 1970 SDL_blit_A.c.obj
rw-r--r-- 0/0    396 Jan  1 01:00 1970 SDL_blit_N.c.obj
rw-r--r-- 0/0    396 Jan  1 01:00 1970 SDL_blit_auto.c.obj
rw-r--r-- 0/0    396 Jan  1 01:00 1970 yuv_rgb_lsx.c.obj
rw-r--r-- 0/0    396 Jan  1 01:00 1970 yuv_rgb_sse.c.obj
rw-r--r-- 0/0    396 Jan  1 01:00 1970 yuv_rgb_std.c.obj
rw-r--r-- 0/0    396 Jan  1 01:00 1970 pch.c.obj

[slouken]

Merged, thanks!