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sdl: add a dumb version of SDL_QuitRequested

--- a/include/npe/SDL2/SDL.h

+++ b/include/npe/SDL2/SDL.h

@@ -52,6 +52,7 @@

 #include <SDL2/SDL_joystick.h>

 #include <SDL2/SDL_events.h>

 #include <SDL2/SDL_thread.h>

+#include <SDL2/SDL_quit.h>

 #include <SDL2/SDL_rwops.h>

 void SDL_StopTextInput(void);

--- a/libnpe_sdl2/events.c

+++ b/libnpe_sdl2/events.c

@@ -16,6 +16,7 @@

 static int kmod;

 static Rune rune;

 static Keyboardctl kctl;

+static int quitreq;

 static Alt salt[Numchan+1] = {

 	[Ckey] = { nil, &rune, CHANRCV },

@@ -73,6 +74,12 @@

 	return -1;

 }

+int

+SDL_QuitRequested(void)

+{

+	return quitreq;

+}

+

 #define ISTEXT(r) ((r) >= 0x20 && ((r) < KF || (r) >= KF+0x1000))

 int

@@ -95,6 +102,7 @@

 			return 1;

 		}else if((npe_sdl.hints & Altf4noclose) == 0 && (kmod & KMOD_LALT) != 0 && rune == (KF|4)){

 			e->type = SDL_QUIT;

+			quitreq = 1;

 			return 1;

 		}else{

 			e->type = (t == Rup) ? SDL_KEYUP : SDL_KEYDOWN;