patch 8.2.0098: exe stack length can be wrong without being detected

Problem:    Exe stack length can be wrong without being detected.
Solution:   Add a check when ABORT_ON_INTERNAL_ERROR is defined.

src/scriptfile.c

@@ -1099,6 +1099,7 @@ do_source(
     proftime_T		    wait_start;
 #endif
     int			    trigger_source_post = FALSE;
+    ESTACK_CHECK_DECLARATION
 
     p = expand_env_save(fname);
     if (p == NULL)
@@ -1216,6 +1217,7 @@ do_source(
 
     // Keep the sourcing name/lnum, for recursive calls.
     estack_push(ETYPE_SCRIPT, fname_exp, 0);
+    ESTACK_CHECK_SETUP
 
 #ifdef STARTUPTIME
     if (time_fd != NULL)
@@ -1355,6 +1357,7 @@ do_source(
 
     if (got_int)
 	emsg(_(e_interr));
+    ESTACK_CHECK_NOW
     estack_pop();
     if (p_verbose > 1)
     {