run VEXos cpu1 scheduler while waiting for abort

This isn't necessarily fixing anything on the V5 in particular (exit requests are handled by CPU0, which then interrupt CPU1 after), but it's certainly more correct and may be required for other single-core VEXos targets if support is added in the future.

Author: Tropix126

library/std/src/sys/pal/vexos/mod.rs

@@ -106,17 +106,19 @@ pub fn abort_internal() -> ! {
     unsafe {
         // Force the serial buffer to flush
         while exit_time.elapsed() < FLUSH_TIMEOUT {
+            vex_sdk::vexTasksRun();
+            
             // If the buffer has been fully flushed, exit the loop
             if vex_sdk::vexSerialWriteFree(stdio::STDIO_CHANNEL) == (stdio::STDOUT_BUF_SIZE as i32)
             {
                 break;
             }
-            vex_sdk::vexTasksRun();
         }
+        
         vex_sdk::vexSystemExitRequest();
-    }
-
-    loop {
-        crate::hint::spin_loop()
+        
+        loop {
+            vex_sdk::vexTasksRun();
+        }
     }
 }