package/libnetconf2: add libxcrypt optional dependency

Fix the following build failure raised since bump of glibc to version
2.39 in commit b5680f53d60acf8ff6010082f873438a39bd5d97:

/home/buildroot/instance-0/output-1/host/opt/ext-toolchain/bin/../lib/gcc/sparc64-buildroot-linux-gnu/12.3.0/../../../../sparc64-buildroot-linux-gnu/bin/ld: cannot find -lcrypt: No such file or directory

Fixes: b5680f53d60acf8ff6010082f873438a39bd5d97
 - http://autobuild.buildroot.org/results/c84e27815cc607ad78a1901cb2be591df2686ac7

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/libnetconf2/Config.in

@@ -4,6 +4,7 @@ config BR2_PACKAGE_LIBNETCONF2
 	depends on BR2_TOOLCHAIN_HAS_THREADS
 	depends on !BR2_STATIC_LIBS
 	depends on BR2_USE_MMU
+	select BR2_PACKAGE_LIBXCRYPT if BR2_TOOLCHAIN_USES_GLIBC
 	select BR2_PACKAGE_LIBYANG
 	help
 	  libnetconf2 is a NETCONF library in C intended for building

package/libnetconf2/libnetconf2.mk

@@ -30,6 +30,10 @@ else
 LIBNETCONF2_CONF_OPTS += -DENABLE_TLS=OFF
 endif
 
+ifeq ($(BR2_PACKAGE_LIBXCRYPT),y)
+LIBNETCONF2_DEPENDENCIES += libxcrypt
+endif
+
 HOST_LIBNETCONF2_CONF_OPTS = \
 	-DENABLE_TESTS=OFF \
 	-DENABLE_VALGRIND_TESTS=OFF \