patch 8.2.1530: Vim9: test fails on MS-Windows

Problem:    Vim9: test fails on MS-Windows.
Solution:   Skip Ex command inside "if false".
diff --git a/src/vim9compile.c b/src/vim9compile.c
index 11a75c1..c9805f6 100644
--- a/src/vim9compile.c
+++ b/src/vim9compile.c
@@ -6879,9 +6879,17 @@
 		    break;
 
 	    default:
-		    // Not recognized, execute with do_cmdline_cmd().
-		    ea.arg = p;
-		    line = compile_exec(line, &ea, &cctx);
+		    if (cctx.ctx_skip == SKIP_YES)
+		    {
+			// We don't check for a next command here.
+			line = (char_u *)"";
+		    }
+		    else
+		    {
+			// Not recognized, execute with do_cmdline_cmd().
+			ea.arg = p;
+			line = compile_exec(line, &ea, &cctx);
+		    }
 		    break;
 	}
 nextline: