Addressed comments

src/misc/unix/SDL_sysurl.c

@@ -40,6 +40,8 @@ int SDL_SYS_OpenURL(const char *url)
 #if USE_POSIX_SPAWN
         pid_t pid2;
         const char *args[] = { "xdg-open", url, NULL };
+        /* Clear LD_PRELOAD so Chrome opens correctly when this application is launched by Steam */
+        unsetenv("LD_PRELOAD");
         if (posix_spawnp(&pid2, args[0], NULL, NULL, (char **)args, environ) == 0) {
             /* Child process doesn't wait for possibly-blocking grandchild. */
             _exit(EXIT_SUCCESS);
@@ -61,7 +63,7 @@ int SDL_SYS_OpenURL(const char *url)
             /* Child process doesn't wait for possibly-blocking grandchild. */
             _exit(EXIT_SUCCESS);
         }
-#endif
+#endif /* USE_POSIX_SPAWN */
     } else if (pid1 < 0) {
         return SDL_SetError("fork() failed: %s", strerror(errno));
     } else {