Add patch headers

Also cleanup the flex patch a bit

sysa/heirloom-devtools-070527/patches/lex_remove_wchar.patch

@@ -3,6 +3,9 @@ From: =?UTF-8?q?Andrius=20=C5=A0tikonas?= <andrius@stikonas.eu>
 Date: Wed, 27 Jan 2021 00:40:19 +0000
 Subject: [PATCH] Workaround for lex to work with mes libc.
 
+Similarily to yacc, remove wchar. See yacc patch for further
+information.
+
 ---
  lex/Makefile.mk |  2 +-
  lex/allprint.c  |  6 ++--

sysa/heirloom-devtools-070527/patches/yacc_remove_wchar.patch

@@ -1,3 +1,10 @@
+Remove all kinds of wchar support. Mes Libc does not support wchar in any form,
+so we need to remove it.
+
+heirloom-devtools is all kinds of broken in this way. C standard dictates that
+wchar_t may be defined as char, however heirloom-devtools does not respect this,
+which makes this non-trivial.
+
 diff -U3 -r yacc/dextern yacc/dextern
 --- yacc/dextern	2005-11-10 20:31:45.000000000 +0000
 +++ yacc/dextern	2021-01-25 18:21:45.286602527 +0000