Split mes libc into a separate source package.

Drop one of the mes git submodules.

sysa/mes-0.23/patches/crt1.patch

@@ -0,0 +1,27 @@
+SPDX-FileCopyrightText: 2021 Paul Dersey <pdersey@gmail.com>
+
+SPDX-License-Identifier: LGPL-2.0-or-later
+
+Fix issue in mes-libc crt where argc was getting truncated to lower byte and
+prevented programs with more than 255 arguments from working correctly. 
+
+--- lib/linux/x86-mes-gcc/crt1.c
++++ lib/linux/x86-mes-gcc/crt1.c
+@@ -48,7 +48,7 @@ _start ()
+   asm (
+        "mov     %%ebp,%%eax\n\t"
+        "add     $4,%%eax\n\t"
+-       "movzbl  (%%eax),%%eax\n\t"
++       "mov     (%%eax),%%eax\n\t"
+        "add     $3,%%eax\n\t"
+        "shl     $2,%%eax\n\t"
+        "add     %%ebp,%%eax\n\t"
+@@ -64,7 +64,7 @@ _start ()
+ 
+        "mov     %ebp,%eax\n\t"
+        "add     $4,%eax\n\t"
+-       "movzbl  (%eax),%eax\n\t"
++       "mov     (%eax),%eax\n\t"
+        "push    %eax\n\t"
+ 
+        "call    main\n\t"