ngage: Remove Nokia N-Gage support.

This can be reverted if a toolchain arrives that can handle C99 features like
variables declared in the middle of a scope, but for now we literally can't
compile SDL3 for this platform.

Fixes #11243.

src/timer/ngage/SDL_systimer.cpp

@@ -1,59 +0,0 @@
-/*
-  Simple DirectMedia Layer
-  Copyright (C) 1997-2024 Sam Lantinga <slouken@libsdl.org>
-
-  This software is provided 'as-is', without any express or implied
-  warranty.  In no event will the authors be held liable for any damages
-  arising from the use of this software.
-
-  Permission is granted to anyone to use this software for any purpose,
-  including commercial applications, and to alter it and redistribute it
-  freely, subject to the following restrictions:
-
-  1. The origin of this software must not be misrepresented; you must not
-     claim that you wrote the original software. If you use this software
-     in a product, an acknowledgment in the product documentation would be
-     appreciated but is not required.
-  2. Altered source versions must be plainly marked as such, and must not be
-     misrepresented as being the original software.
-  3. This notice may not be removed or altered from any source distribution.
-*/
-#include "SDL_internal.h"
-
-#ifdef SDL_TIMER_NGAGE
-
-#include <e32std.h>
-#include <e32hal.h>
-
-static TUint start_tick = 0;
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-
-Uint64 SDL_GetPerformanceCounter(void)
-{
-    // FIXME: Need to account for 32-bit wrapping
-    return (Uint64)User::TickCount();
-}
-
-Uint64 SDL_GetPerformanceFrequency(void)
-{
-    return SDL_US_PER_SECOND;
-}
-
-void SDL_SYS_DelayNS(Uint64 ns)
-{
-    const Uint64 max_delay = 0x7fffffffLL * SDL_NS_PER_US;
-    if (ns > max_delay) {
-        ns = max_delay;
-    }
-    User::After(TTimeIntervalMicroSeconds32((TInt)SDL_NS_TO_US(ns)));
-}
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif // SDL_TIMER_NGAGE