turn on MICROPY_PYEXEC_ENABLE_EXIT_CODE_HANDLING all the time

Author: dhalbert

main.c

@@ -1149,7 +1149,7 @@ int __attribute__((used)) main(void) {
             } else {
                 skip_repl = false;
             }
-        } else if (exit_code != 0) {
+        } else if (exit_code != PYEXEC_NORMAL_EXIT) {
             break;
         }
 

py/circuitpy_mpconfig.h

@@ -51,6 +51,9 @@ extern void common_hal_mcu_enable_interrupts(void);
 #define MICROPY_VFS_LFS1                 (0)
 #define MICROPY_VFS_LFS2                 (0)
 
+// Always turn on exit code handling
+#define MICROPY_PYEXEC_ENABLE_EXIT_CODE_HANDLING (1)
+
 #ifndef MICROPY_GCREGS_SETJMP
 #define MICROPY_GCREGS_SETJMP            (0)
 #endif