net-snmp: portability fixes from Alpine.

srcpkgs/net-snmp/patches/fix-includes.patch

@@ -0,0 +1,10 @@
+--- agent/mibgroup/util_funcs/get_pid_from_inode.c.orig
++++ agent/mibgroup/util_funcs/get_pid_from_inode.c
+@@ -4,6 +4,7 @@
+ 
+ #include <net-snmp/output_api.h>
+ 
++#include <limits.h>
+ #include <ctype.h>
+ #include <stdio.h>
+ #if HAVE_STDLIB_H

srcpkgs/net-snmp/patches/netsnmp-swinst-crash.patch

@@ -0,0 +1,13 @@
+--- agent/mibgroup/host/data_access/swinst_pkginfo.c.orig
++++ agent/mibgroup/host/data_access/swinst_pkginfo.c
+@@ -207,7 +207,9 @@
+ 	    memcpy( entry->swDate, cp, date_len );
+ 	    entry->swDate_len = date_len;
+ 	}
+-	closedir( d );
++	if (d != NULL)
++		closedir( d );
++
+ #ifdef HAVE_LIBPKG
+     }
+ #endif

srcpkgs/net-snmp/template

@@ -1,7 +1,7 @@
 # Template build file for 'net-snmp'.
 pkgname=net-snmp
 version=5.7.3
-revision=3
+revision=4
 hostmakedepends="pkg-config unzip"
 makedepends="bzip2-devel libressl-devel libnl-devel pciutils-devel"
 short_desc="Simple Network Management Protocol (SNMP) suite"
@@ -12,6 +12,8 @@ license="BSD"
 distfiles="$SOURCEFORGE_SITE/$pkgname/$pkgname-$version.zip"
 checksum=e8dfc79b6539b71a6ff335746ce63d2da2239062ad41872fff4354cafed07a3e
 
+LDFLAGS="-lpthread"
+
 do_configure() {
 	./configure ${configure_args} --enable-ucd-snmp-compatibility \
 		--enable-ipv6 --with-default-snmp-version="3" \