addpkg(main): liburcu

- Required by `dnsutils` since version 9.20.4

Signed-off-by: Aditya Alok <alok@termux.dev>

packages/liburcu/build.sh

@@ -0,0 +1,8 @@
+TERMUX_PKG_HOMEPAGE="https://liburcu.org/"
+TERMUX_PKG_DESCRIPTION="LGPLv2.1 userspace RCU (read-copy-update) library"
+TERMUX_PKG_LICENSE="LGPL-2.1"
+TERMUX_PKG_LICENSE_FILE="LICENSES/${TERMUX_PKG_LICENSE}-only.txt"
+TERMUX_PKG_MAINTAINER="@termux"
+TERMUX_PKG_VERSION=0.15
+TERMUX_PKG_SRCURL="https://lttng.org/files/urcu/userspace-rcu-latest-${TERMUX_PKG_VERSION}.tar.bz2"
+TERMUX_PKG_SHA256=4f2d839af67905ad396d6d53ba5649b66113d90840dcbc89941e0da64bccd38c

packages/liburcu/disable-tests.patch

@@ -0,0 +1,12 @@
+# Although it just builds, still disable it.
+--- userspace-rcu-0.15.0/Makefile.in	2024-12-19 19:49:26.000000000 +0530
++++ userspace-rcu-0.15.0.mod/Makefile.in	2025-01-23 16:33:27.627942132 +0530
+@@ -400,7 +400,7 @@
+ top_builddir = @top_builddir@
+ top_srcdir = @top_srcdir@
+ ACLOCAL_AMFLAGS = -I m4
+-SUBDIRS = include src doc tests extras
++SUBDIRS = include src doc extras
+ dist_doc_DATA = \
+ 	LICENSE.md \
+ 	README.md