net-analyzer/nagios-plugins: new "rpc" USE flag

The path to rpcinfo is detected at build time and if it is not found,
check_rpc won't work. We add a USE flag to pull in net-nds/rpcbind at
both build and run-time.

Bug: https://bugs.gentoo.org/964247
Signed-off-by: Michael Orlitzky <mjo@gentoo.org>

net-analyzer/nagios-plugins/metadata.xml

@@ -26,6 +26,10 @@
       Install <pkg>net-analyzer/fping</pkg> required for fancy ping
       monitoring. Disabling the flag does not remove any plugin file.
     </flag>
+    <flag name="rpc">
+      Install <pkg>net-nds/rpcbind</pkg> required for monitoring RPC
+      services. Disabling the flag does not remove any plugin file.
+    </flag>
     <flag name="ssh">
       Install <pkg>net-misc/openssh</pkg> required for monitoring SSH
       servers. Disabling the flag does not remove any plugin file.

net-analyzer/nagios-plugins/nagios-plugins-2.4.12-r3.ebuild

@@ -12,7 +12,7 @@ SRC_URI="https://github.com/${PN}/${PN}/releases/download/release-${PV}/${P}.tar
 LICENSE="GPL-2"
 SLOT="0"
 KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~ppc ~ppc64 ~riscv ~sparc ~x86"
-IUSE="ipv6 ldap mysql nagios-dns nagios-ping nagios-game nls postgres radius samba selinux snmp ssh +ssl"
+IUSE="ipv6 ldap mysql nagios-dns nagios-ping nagios-game nls postgres radius samba selinux snmp ssh +ssl rpc"
 
 # Most of the plugins use automagic dependencies, i.e. the plugin will
 # get built if the binary it uses is installed. For example, check_snmp
@@ -23,6 +23,7 @@ AUTOMAGIC_DEPEND="
 	nagios-dns? ( net-dns/bind )
 	nagios-game? ( games-util/qstat )
 	nagios-ping? ( net-analyzer/fping )
+	rpc? ( net-nds/rpcbind )
 	samba? ( net-fs/samba )
 	ssh? ( virtual/openssh )
 	snmp? ( dev-perl/Net-SNMP