Fix test_sdl3_ttf. NFC (#26446)

Also, make the SDL3 warning show up every time its used, not just when
its built. This is why this error didn't show up in our CI, because if
another SDL3 test ran first it would suppress this warning.

Author: sbc100

test/test_browser.py

@@ -2164,7 +2164,7 @@ def test_sdl3_ttf_render_text_solid(self):
     shutil.copy2(test_file('freetype/LiberationSansBold.ttf'), self.get_dir())
     self.reftest('test_sdl3_ttf_render_text_solid.c', 'test_sdl3_ttf_render_text_solid.png',
                  cflags=[
-                  '-O2', '-sUSE_SDL=3', '-sUSE_SDL_TTF=3', '-lGL',
+                  '-O2', '-sUSE_SDL=3', '-sUSE_SDL_TTF=3', '-lGL', '-Wno-experimental',
                   '--embed-file', 'LiberationSansBold.ttf'])
 
   def test_sdl_alloctext(self):

test/test_other.py

@@ -2694,8 +2694,8 @@ def test_sdl2_ttf(self):
   @requires_network
   def test_sdl3_ttf(self):
     # A compile-only test that checks if sdl3-ttf, and dependencies freetype and harfbuzz, are buildable.
-    self.emcc(test_file('browser/test_sdl3_ttf.c'), args=['-sUSE_SDL=3', '-sUSE_SDL_TTF=3'])
-    self.emcc(test_file('browser/test_sdl3_ttf.c'), args=['--use-port=sdl3', '--use-port=sdl3_ttf'])
+    self.emcc(test_file('browser/test_sdl3_ttf.c'), args=['-Wno-experimental', '-sUSE_SDL=3', '-sUSE_SDL_TTF=3'])
+    self.emcc(test_file('browser/test_sdl3_ttf.c'), args=['-Wno-experimental', '--use-port=sdl3', '--use-port=sdl3_ttf'])
 
   @requires_network
   def test_contrib_ports(self):

tools/ports/sdl3.py

@@ -26,11 +26,12 @@ def get_lib_name(settings):
 
 
 def get(ports, settings, shared):
+  diagnostics.warning('experimental', 'sdl3 port is still experimental')
+
   # get the port
   ports.fetch_project('sdl3', f'https://github.com/libsdl-org/SDL/archive/{TAG}.zip', sha512hash=HASH)
 
   def create(final):
-    diagnostics.warning('experimental', 'sdl3 port is still experimental')
     root_dir = ports.get_dir('sdl3', SUBDIR)
 
     # In addition copy our pre-generated SDL_build_config.h file.