build: only define HAVE_SNMP

NetSNMP is the only SNMP implementation for Quagga. We don't need two
different symbols.
diff --git a/bgpd/bgp_snmp.c b/bgpd/bgp_snmp.c
index 86cc087..f6b1056 100644
--- a/bgpd/bgp_snmp.c
+++ b/bgpd/bgp_snmp.c
@@ -21,14 +21,8 @@
 #include <zebra.h>
 
 #ifdef HAVE_SNMP
-#ifdef HAVE_NETSNMP
 #include <net-snmp/net-snmp-config.h>
 #include <net-snmp/net-snmp-includes.h>
-#else
-#include <asn1.h>
-#include <snmp.h>
-#include <snmp_impl.h>
-#endif
 
 #include "if.h"
 #include "log.h"
diff --git a/configure.ac b/configure.ac
index 80f65b9..c3c651f 100755
--- a/configure.ac
+++ b/configure.ac
@@ -1370,8 +1370,7 @@
         LIBS="${LIBS} -lcrypto";
     fi
     AC_CHECK_LIB(netsnmp, asn_parse_int,
-    	[AC_DEFINE(HAVE_NETSNMP,,Net SNMP) 
-    	 AC_DEFINE(HAVE_SNMP,,SNMP)
+    	[AC_DEFINE(HAVE_SNMP,,SNMP)
     	 LIBS="${LIBS} -lnetsnmp"],
     	[AC_MSG_ERROR([--enable-snmp given, but cannot find support for SNMP])])
 
diff --git a/lib/smux.c b/lib/smux.c
index b7cd18d..145ec90 100644
--- a/lib/smux.c
+++ b/lib/smux.c
@@ -22,14 +22,8 @@
 #include <zebra.h>
 
 #ifdef HAVE_SNMP
-#ifdef HAVE_NETSNMP
 #include <net-snmp/net-snmp-config.h>
 #include <net-snmp/net-snmp-includes.h>
-#else
-#include <asn1.h>
-#include <snmp.h>
-#include <snmp_impl.h>
-#endif
 
 #include "log.h"
 #include "thread.h"
diff --git a/ospf6d/ospf6_snmp.c b/ospf6d/ospf6_snmp.c
index 5ac7846..11b733b 100644
--- a/ospf6d/ospf6_snmp.c
+++ b/ospf6d/ospf6_snmp.c
@@ -23,14 +23,8 @@
 
 #ifdef HAVE_SNMP
 
-#ifdef HAVE_NETSNMP
 #include <net-snmp/net-snmp-config.h>
 #include <net-snmp/net-snmp-includes.h>
-#else
-#include <asn1.h>
-#include <snmp.h>
-#include <snmp_impl.h>
-#endif
 
 #include "log.h"
 #include "vty.h"
diff --git a/ospfd/ospf_snmp.c b/ospfd/ospf_snmp.c
index 9c9dd47..739dcae 100644
--- a/ospfd/ospf_snmp.c
+++ b/ospfd/ospf_snmp.c
@@ -25,14 +25,8 @@
 #include <zebra.h>
 
 #ifdef HAVE_SNMP
-#ifdef HAVE_NETSNMP
 #include <net-snmp/net-snmp-config.h>
 #include <net-snmp/net-snmp-includes.h>
-#else
-#include <asn1.h>
-#include <snmp.h>
-#include <snmp_impl.h>
-#endif
 
 #include "if.h"
 #include "log.h"
diff --git a/ripd/rip_snmp.c b/ripd/rip_snmp.c
index 61c47c7..803ac85 100644
--- a/ripd/rip_snmp.c
+++ b/ripd/rip_snmp.c
@@ -22,14 +22,8 @@
 #include <zebra.h>
 
 #ifdef HAVE_SNMP
-#ifdef HAVE_NETSNMP
 #include <net-snmp/net-snmp-config.h>
 #include <net-snmp/net-snmp-includes.h>
-#else
-#include <asn1.h>
-#include <snmp.h>
-#include <snmp_impl.h>
-#endif
 
 #include "if.h"
 #include "log.h"
diff --git a/zebra/zebra_snmp.c b/zebra/zebra_snmp.c
index 0fde4bb..3dbfb58 100644
--- a/zebra/zebra_snmp.c
+++ b/zebra/zebra_snmp.c
@@ -22,14 +22,8 @@
 #include <zebra.h>
 
 #ifdef HAVE_SNMP
-#ifdef HAVE_NETSNMP
 #include <net-snmp/net-snmp-config.h>
 #include <net-snmp/net-snmp-includes.h>
-#else
-#include <asn1.h>
-#include <snmp.h>
-#include <snmp_impl.h>
-#endif
 
 #include "if.h"
 #include "log.h"