package/netsnmp: drop autoreconf

Commit 83b4337354014 (package/netsnmp: security bump to version 5.9.3)
dropped the patches, but forgot to remove the autoreconf.  Do so now.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/netsnmp/netsnmp.mk

@@ -40,7 +40,6 @@ NETSNMP_INSTALL_STAGING_OPTS = DESTDIR=$(STAGING_DIR) LIB_LDCONFIG_CMD=true inst
 NETSNMP_INSTALL_TARGET_OPTS = DESTDIR=$(TARGET_DIR) LIB_LDCONFIG_CMD=true install
 NETSNMP_MAKE = $(MAKE1)
 NETSNMP_CONFIG_SCRIPTS = net-snmp-config
-NETSNMP_AUTORECONF = YES
 
 ifeq ($(BR2_ENDIAN),"BIG")
 NETSNMP_CONF_OPTS += --with-endianness=big