From: Thomas Renninger <trenn@suse.com>
Subject: Fix compile issue if net-snmp has NETSNMP_DISABLE_MD5 set
References: 
Patch-Mainline: 
Git-commit: be1a9d5975e4568774a46711d1366086978e9347
Git-repo: git@github.com:watologo1/collectd.git.git

Otherwise one gets:
src/snmp.c: In function 'csnmp_config_add_host_auth_protocol':
src/snmp.c:678:25: error: 'usmHMACMD5AuthProtocol' undeclared (first use in this function); did you mean 'usmHMACSHA1AuthProtocol'?
   678 |     hd->auth_protocol = usmHMACMD5AuthProtocol;
       |                         ^~~~~~~~~~~~~~~~~~~~~~
       |                         usmHMACSHA1AuthProtocol


Signed-off-by:  <trenn@suse.com>
diff --git a/src/snmp.c b/src/snmp.c
index 827d62eb..078ef3ee 100644
--- a/src/snmp.c
+++ b/src/snmp.c
@@ -677,7 +677,7 @@ static int csnmp_config_add_host_auth_protocol(host_definition_t *hd,
   if (status != 0)
     return status;
 
-#ifdef NETSNMP_USMAUTH_HMACMD5
+#ifndef NETSNMP_DISABLE_MD5
   if (strcasecmp("MD5", buffer) == 0) {
     hd->auth_protocol = usmHMACMD5AuthProtocol;
     hd->auth_protocol_len = sizeof(usmHMACMD5AuthProtocol) / sizeof(oid);