Fix check_stdlib_usage.py libc call matching

It now matches libc usage inside statements,
and skips libc-like usage in strings or as struct members.

src/camera/pipewire/SDL_camera_pipewire.c

@@ -330,7 +330,7 @@ static struct param *param_add(struct spa_list *params,
         id = SPA_POD_OBJECT_ID(param);
     }
 
-    p = malloc(sizeof(*p) + (param != NULL ? SPA_POD_SIZE(param) : 0));
+    p = malloc(sizeof(*p) + (param != NULL ? SPA_POD_SIZE(param) : 0)); // This should NOT be SDL_malloc()
     if (p == NULL)
         return NULL;
 
@@ -950,7 +950,7 @@ static void hotplug_registry_global_callback(void *object, uint32_t id,
         g->permissions = permissions;
         g->props = props ? PIPEWIRE_pw_properties_new_dict(props) : NULL;
         g->proxy = proxy;
-        g->name = strdup(name);
+        g->name = strdup(name); // This should NOT be SDL_strdup()
         spa_list_init(&g->pending_list);
         spa_list_init(&g->param_list);
         spa_list_append(&hotplug.global_list, &g->link);

src/dynapi/SDL_dynapi.c

@@ -515,7 +515,7 @@ static void SDL_InitDynamicAPILocked(void)
     const DWORD rc = GetEnvironmentVariableA(SDL_DYNAMIC_API_ENVVAR, envbuf, (DWORD) sizeof (envbuf));
     char *libname = ((rc != 0) && (rc < sizeof (envbuf))) ? envbuf : NULL;
 #else
-    char *libname = getenv(SDL_DYNAMIC_API_ENVVAR);
+    char *libname = getenv(SDL_DYNAMIC_API_ENVVAR); // This should NOT be SDL_getenv()
 #endif
 
     SDL_DYNAPI_ENTRYFN entry = NULL; // funcs from here by default.

src/main/emscripten/SDL_sysmain_runapp.c

@@ -31,7 +31,7 @@ EM_JS_DEPS(sdlrunapp, "$dynCall,$stringToNewUTF8");
 // even though we reference the C runtime's free() in other places, it appears
 // to be inlined more aggressively in Emscripten 4, so we need a reference to
 // it here, too, so the inlined Javascript doesn't fail to find it.
-EMSCRIPTEN_KEEPALIVE void force_free(void *ptr) { free(ptr); }
+EMSCRIPTEN_KEEPALIVE void force_free(void *ptr) { free(ptr); } // This should NOT be SDL_free()
 
 int SDL_RunApp(int argc, char *argv[], SDL_main_func mainFunction, void * reserved)
 {

src/sensor/emscripten/SDL_emscriptensensor.c

@@ -45,9 +45,9 @@ static void SDL_EMSCRIPTEN_AccelerometerCallback(const EmscriptenDeviceMotionEve
 
     // Convert from browser specific gravity constant to SDL_STANDARD_GRAVITY.
     total_gravity = 0.0;
-    total_gravity += fabs(event->accelerationIncludingGravityX - event->accelerationX);
-    total_gravity += fabs(event->accelerationIncludingGravityY - event->accelerationY);
-    total_gravity += fabs(event->accelerationIncludingGravityZ - event->accelerationZ);
+    total_gravity += SDL_fabs(event->accelerationIncludingGravityX - event->accelerationX);
+    total_gravity += SDL_fabs(event->accelerationIncludingGravityY - event->accelerationY);
+    total_gravity += SDL_fabs(event->accelerationIncludingGravityZ - event->accelerationZ);
 
     gravity[0] = (event->accelerationIncludingGravityX - event->accelerationX) / total_gravity;
     gravity[1] = (event->accelerationIncludingGravityY - event->accelerationY) / total_gravity;

src/video/kmsdrm/SDL_kmsdrmvideo.c

@@ -398,7 +398,7 @@ static int get_plane_id(SDL_VideoDevice *_this, unsigned int crtc_id, uint32_t p
                 drmModePropertyPtr p = KMSDRM_drmModeGetProperty(viddata->drm_fd,
                     props->props[j]);
 
-                if ((strcmp(p->name, "type") == 0) && (props->prop_values[j] == plane_type)) {
+                if ((SDL_strcmp(p->name, "type") == 0) && (props->prop_values[j] == plane_type)) {
                     /* found our plane, use that: */
                     found = 1;
                 }

src/video/uikit/SDL_uikitappdelegate.m

@@ -53,7 +53,7 @@ int SDL_RunApp(int argc, char *argv[], SDL_main_func mainFunction, void *reserve
     forward_argc = argc;
     forward_argv = (char **)malloc((argc + 1) * sizeof(char *)); // This should NOT be SDL_malloc()
     for (int i = 0; i < argc; i++) {
-        forward_argv[i] = malloc((strlen(argv[i]) + 1) * sizeof(char)); // This should NOT be SDL_malloc()
+        forward_argv[i] = malloc((SDL_strlen(argv[i]) + 1) * sizeof(char)); // This should NOT be SDL_malloc()
         strcpy(forward_argv[i], argv[i]);
     }
     forward_argv[argc] = NULL;