Patch for netqmail-1.06 by Roberto Puzzanghera https://notes.sagredo.eu
It gets netqmail to compile with gcc-10

The compilation breaks was caused by the qmail-hide-ip-headers.patch,
(https://notes.sagredo.eu/files/hacks/qmail/patches/qmail-hide-ip-headers.patch)
which was revised.

=================================================================================

diff -ruN netqmail-1.06-original/received.c netqmail-1.06/received.c
--- netqmail-1.06-original/received.c   2020-12-04 19:05:28.395202615 +0100
+++ netqmail-1.06/received.c    2020-12-04 19:07:55.609122706 +0100
@@ -21,8 +21,8 @@
   return 0;
 }
 
-char *relayclient;
-int relayclientlen;
+extern char *relayclient;
+extern int relayclientlen;
 
 void safeput(qqt,s)
 struct qmail *qqt;
@@ -62,7 +62,7 @@
   if (remoteinfo) {
     safeput(qqt,remoteinfo);
   }
-  relayclient = env_get("RELAYCLIENT");
+  char relayclient = env_get("RELAYCLIENT");
   if (!relayclient) {
     if (remoteinfo) { qmail_puts(qqt,"@"); }
      safeput(qqt,remoteip);