pycryptodome: new recipe (#7714)

* pycryptodome: new recipe

* Add the "separate_namespace" version: pycryptodomex.

This one installs as "Cryptodome", as to not conflict with pycrypto.

Minor clean ups on both recipes. Build, installed, and smoke-tested
on both x86_64 and x86_32 (GCC11).

dev-python/pycryptodome/patches/pycryptodome-3.16.0.patchset

@@ -0,0 +1,22 @@
+From 4fde02e923cc6f62a000caa66c12705ae5d2c6d3 Mon Sep 17 00:00:00 2001
+From: Oscar Lesta <oscar.lesta@gmail.com>
+Date: Sun, 1 Jan 2023 07:35:12 -0300
+Subject: Change header guard to not clash with the one from Haiku's Errors.h
+
+It was causing some compilation errors that were a bit puzzling.
+
+diff --git a/src/errors.h b/src/errors.h
+index 831980d..89834ce 100644
+--- a/src/errors.h
++++ b/src/errors.h
+@@ -1,5 +1,5 @@
+-#ifndef _ERRORS_H
+-#define _ERRORS_H
++#ifndef _ERRORS_CRYPTODOME_H
++#define _ERRORS_CRYPTODOME_H
+ 
+ /** Standard errors common to all ciphers **/
+ #define ERR_NULL                1
+-- 
+2.37.3
+