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 4f5f0fc36cc7f34fad05e45671dfa7b8dc32fd51.

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

src/main/ngage/SDL_ngage_main.cpp

@@ -0,0 +1,82 @@
+/*
+    EPOC version (originally for SDL 1.2) by Hannu Viitala
+    (hannu.j.viitala@mbnet.fi).
+*/
+#include "../../SDL_internal.h"
+
+/* Include the SDL main definition header */
+#include "SDL_main.h"
+
+#include <e32std.h>
+#include <e32def.h>
+#include <e32svr.h>
+#include <e32base.h>
+#include <estlib.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <w32std.h>
+#include <apgtask.h>
+
+#include "SDL_error.h"
+
+extern "C" int main(int argc, char *argv[]);
+
+TInt E32Main()
+{
+    /*  Get the clean-up stack */
+    CTrapCleanup* cleanup = CTrapCleanup::New();
+
+    /* Arrange for multi-threaded operation */
+    SpawnPosixServerThread();
+
+    /* Get args and environment */
+    int    argc = 0;
+    char** argv = 0;
+    char** envp = 0;
+
+    __crt0(argc,argv,envp);
+
+    /* Start the application! */
+
+    /* Create stdlib */
+    _REENT;
+
+    /* Set process and thread priority and name */
+
+    RThread  currentThread;
+    RProcess thisProcess;
+    TParse   exeName;
+    exeName.Set(thisProcess.FileName(), NULL, NULL);
+    currentThread.Rename(exeName.Name());
+    currentThread.SetProcessPriority(EPriorityLow);
+    currentThread.SetPriority(EPriorityMuchLess);
+
+    /* Increase heap size */
+    RHeap* newHeap  = NULL;
+    RHeap* oldHeap  = NULL;
+    TInt   heapSize = 7500000;
+    int    ret;
+
+    newHeap = User::ChunkHeap(NULL, heapSize, heapSize, KMinHeapGrowBy);
+
+    if (NULL == newHeap)
+    {
+        ret = 3;
+        goto cleanup;
+    }
+    else
+    {
+        oldHeap = User::SwitchHeap(newHeap);
+        /* Call stdlib main */
+        ret = main(argc, argv);
+    }
+
+cleanup:
+    _cleanup();
+
+    CloseSTDLIB();
+    delete cleanup;
+    return ret;
+}
+
+/* vi: set ts=4 sw=4 expandtab: */