Fix simon scripts for gp2c usage

[jdemeyer]

Various fixes which are required for gp2c, but which do not otherwise change the functionality of these scripts.

CC: @JohnCremona

Component: misc

Author: Jeroen Demeyer

Branch/Commit: a6e0513

Reviewer: Volker Braun

Issue created by migration from https://trac.sagemath.org/ticket/18874

[jdemeyer]

Branch: u/jdemeyer/fix_braces_in_simon_scripts

[jdemeyer]

New commits:

50085c5

Fix braces in Simon's scripts for gp2c usage

[jdemeyer]

Commit: 50085c5

[jdemeyer]

Description changed:

--- 
+++ 
@@ -1 +1 @@
-This is needed for gp2c.
+Various fixes which are required for gp2c, but which do not otherwise change the functionality of these scripts.

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. New commits:

a6e0513

Remove duplicate global variables

[sagetrac-git]

Changed commit from 50085c5 to a6e0513