libtirpc: bump to 0.2.4

This commit bumps the version of libtirpc to the latest upstream
version 0.2.4, with the following changes on the patches:

 Updated to take into account minor upstream changes:

 - libtirpc-0001-Disable-parts-of-TIRPC-requiring-NIS-support.patch
 - libtirpc-0002-uClibc-without-RPC-support-does-not-install-rpcent.h.patch
 - libtirpc-0004-Make-IPv6-support-optional.patch
 - libtirpc-0008-Add-rpcgen-program-from-nfs-utils-sources.patch
 - libtirpc-0009-Automatically-generate-XDR-header-files-from-.x-sour.patch
 - libtirpc-0010-Add-more-XDR-files-needed-to-build-rpcbind-on-top-of.patch

 Removed since they were merged upstream:

 - libtirpc-0003-Add-missing-INET6-conditional.patch
 - libtirpc-0005-rpcent-mark-getrpcbyname-name-argument-as-const-char.patch
 - libtirpc-0006-rpcent-remove-prototypes-of-reentrant-variants.patch
 - libtirpc-0007-doc-Makefile.am-fix-out-of-tree-installation.patch

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>