Add support for the Nokia N-Gage (#5597)

* Add initial support for the Nokia N-Gage

* N-Gage: disable clipping for the time being, issue needs to be resolved later

* Move va_copy definition to SDL_internal.h

* Move stdlib.h include to SDL_config_ngage.h, much cleaner this way

* Remove redundant include, add HAVE_STDLIB_H

* Revert "N-Gage: disable clipping for the time being, issue needs to be resolved later"

This reverts commit 4f5f0fc36c.

* N-Gage: fix clipping issue by providing proper math functions

src/timer/ngage/SDL_systimer.cpp

@@ -0,0 +1,100 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2022 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"
+
+#if defined(SDL_TIMER_NGAGE)
+
+#include <e32std.h>
+#include <e32hal.h>
+
+#include "SDL_timer.h"
+
+static SDL_bool ticks_started = SDL_FALSE;
+static TUint    start         = 0;
+static TInt     tickPeriodMilliSeconds;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void
+SDL_TicksInit(void)
+{
+    if (ticks_started)
+    {
+        return;
+    }
+    ticks_started = SDL_TRUE;
+    start         = User::TickCount();
+
+    TTimeIntervalMicroSeconds32 period;
+    TInt                        tmp = UserHal::TickPeriod(period);
+
+    (void)tmp; /* Suppress redundant warning. */
+
+    tickPeriodMilliSeconds = period.Int() / 1000;
+}
+
+void
+SDL_TicksQuit(void)
+{
+    ticks_started = SDL_FALSE;
+}
+
+Uint64
+SDL_GetTicks64(void)
+{
+    if (! ticks_started)
+    {
+        SDL_TicksInit();
+    }
+
+    TUint deltaTics = User::TickCount() - start;
+
+    // Overlaps early, but should do the trick for now.
+    return (Uint64)(deltaTics * tickPeriodMilliSeconds);
+}
+
+Uint64
+SDL_GetPerformanceCounter(void)
+{
+    return (Uint64)User::TickCount();
+}
+
+Uint64
+SDL_GetPerformanceFrequency(void)
+{
+    return 1000000;
+}
+
+void
+SDL_Delay(Uint32 ms)
+{
+    User::After(TTimeIntervalMicroSeconds32(ms * 1000));
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* SDL_TIMER_NGAGE */
+
+/* vi: set ts=4 sw=4 expandtab: */