Rename scr_init

scr_init conflicts with SDL, rename to bk_scr_init

defines.h

@@ -157,7 +157,7 @@ int load_src(register pdp_regs *p, d_word *data);
 #define PDP_FULL_MEM_SIZE       (64 * 512)  /* 0 - 177777 */
 
 extern void line_init(void);
-void scr_init(void);
+void bk_scr_init(void);
 void boot_init(void);
 void timer_init(void);
 void printer_init(void);

scr-sdl.c

@@ -185,7 +185,7 @@ setup_bases() {
 }
 
 void
-scr_init() {
+bk_scr_init() {
 
     static char init_done = 0;
     int i;

standalone.c

@@ -181,7 +181,7 @@ by the environment variable BK_PATH.\n"), romdir );
 	ev_init();		/* initialize the event system */
 	sim_init();		/* ...the simulated cpu */
 	mem_init();		/* ...main memory */
-	scr_init();		/* video display */
+	bk_scr_init();		/* video display */
 	boot_init();		/* ROM blocks */
 	if (terak) {
 		// setup_terak();