package/libyang: disable tests

Disable tests which are enabled by default in debug mode since bump to
version 2.0.0 in commit 2a3edc5e00 and
e84f12fc5e
as they will raise the following build failure if cmocka is built before
libyang:

In file included from /home/buildroot/autobuild/instance-0/output-1/host/riscv64-buildroot-linux-musl/sysroot/usr/include/stdint.h:20,
                 from /home/buildroot/autobuild/instance-0/output-1/host/opt/ext-toolchain/lib/gcc/riscv64-buildroot-linux-musl/10.3.0/include/stdint.h:9,
                 from /home/buildroot/autobuild/instance-0/output-1/build/libyang-2.0.112/src/libyang.h:18,
                 from /home/buildroot/autobuild/instance-0/output-1/build/libyang-2.0.112/tests/utests/utests.h:30,
                 from /home/buildroot/autobuild/instance-0/output-1/build/libyang-2.0.112/tests/utests/extensions/test_yangdata.c:15:
/home/buildroot/autobuild/instance-0/output-1/host/riscv64-buildroot-linux-musl/sysroot/usr/include/bits/alltypes.h:53:24: error: conflicting types for 'uintptr_t'
   53 | typedef unsigned _Addr uintptr_t;
      |                        ^~~~~~~~~

Fixes:
 - http://autobuild.buildroot.org/results/7ae21fbb28b1a69183c5d8ed87cf5f5cbf055026

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
(cherry picked from commit ea6cc91be4)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/libyang/libyang.mk

@@ -15,9 +15,11 @@ LIBYANG_DEPENDENCIES = pcre2
 HOST_LIBYANG_DEPENDENCIES = host-pcre2
 
 LIBYANG_CONF_OPTS = \
+	-DENABLE_TESTS=OFF \
 	-DENABLE_VALGRIND_TESTS=OFF
 
 HOST_LIBYANG_CONF_OPTS = \
+	-DENABLE_TESTS=OFF \
 	-DENABLE_VALGRIND_TESTS=OFF
 
 $(eval $(cmake-package))