Drop no longer used Autoheader macros #1200

1. 
   hebasto commented at 7:30 am on January 28, 2023: member

   A cleanup after #1178.
2. Drop no longer used Autoheader macros 9b7d18669d
3. real-or-random approved
4. 
   real-or-random commented at 7:45 am on January 28, 2023: contributor

   utACK 9b7d18669dc2410bde7690d9b04d90b3dc3e25ce
5. 
   kevkevinpal commented at 3:46 am on January 30, 2023: none

   utACK 9b7d186

   Ran the grep below and looks like I only found those macros in configure.ac

   0➜  secp256k1 git:(master) ✗ grep -nri -e "AH_BOTTOM" -e "AH_TOP" ./
   1.//configure.ac:25:AH_TOP([#ifndef LIBSECP256K1_CONFIG_H])
   2.//configure.ac:26:AH_TOP([#define LIBSECP256K1_CONFIG_H])
   3.//configure.ac:27:AH_BOTTOM([#endif /*LIBSECP256K1_CONFIG_H*/])
   

6. 
   sipa commented at 4:41 am on January 30, 2023: contributor

   utACK 9b7d18669dc2410bde7690d9b04d90b3dc3e25ce
7. sipa merged this on Jan 30, 2023
8. sipa closed this on Jan 30, 2023

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9. hebasto deleted the branch on Jan 30, 2023
10. hebasto referenced this in commit 7c0cc5d976 on Mar 7, 2023
11. dhruv referenced this in commit a5df79db12 on Mar 7, 2023
12. dhruv referenced this in commit 77b510d84c on Mar 7, 2023
13. sipa referenced this in commit 763079a3f1 on Mar 8, 2023
14. div72 referenced this in commit 945b094575 on Mar 14, 2023
15. vmta referenced this in commit e1120c94a1 on Jun 4, 2023
16. vmta referenced this in commit 8f03457eed on Jul 1, 2023
17. jonasnick cross-referenced this on Jul 20, 2023 from issue Upstream PRs 1160, 1193, 1169, 1190, 1192, 1194, 1196, 1195, 1170, 1172, 1200, 1199, 1203, 1201, 1206, 1078, 1209, 979, 1212, 1218, 1217, 1221, 1222 by jonasnick

Contributors
hebasto real-or-random kevkevinpal sipa