package/leafnode2: add optional dependency to libxcrypt

When glibc was bumped to version 2.39 in commit
b5680f53d60acf8ff6010082f873438a39bd5d97 it removed the deprecated
libcrypt support.

As glibc's libcrypt was providing leafnode2's libcrypt dependency this
broke the leafnode2 build using glibc version 2.39.

To fix this select the libxcrypt dependency to leafnode2 when using a
glibc toolchain and add the dependency if selected.

Fixes:
http://autobuild.buildroot.net/results/08f86ce128623105087cda0c5b32a1d0d0cfa166/

Signed-off-by: Bernd Kuhls <bernd@kuhls.net>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/leafnode2/Config.in

@@ -1,6 +1,7 @@
 config BR2_PACKAGE_LEAFNODE2
 	bool "leafnode2"
 	depends on BR2_USE_MMU # fork()
+	select BR2_PACKAGE_LIBXCRYPT if BR2_TOOLCHAIN_USES_GLIBC
 	select BR2_PACKAGE_PCRE
 	help
 	  Leafnode-2 is a store-and-forward NNTP (or Usenet) proxy

package/leafnode2/leafnode2.mk

@@ -14,6 +14,10 @@ LEAFNODE2_AUTORECONF = YES
 LEAFNODE2_CONF_ENV = \
 	PCRECONFIG="$(STAGING_DIR)/usr/bin/pcre-config"
 
+ifeq ($(BR2_PACKAGE_LIBXCRYPT),y)
+LEAFNODE2_DEPENDENCIES += libxcrypt
+endif
+
 # --enable-runas-user use 'news' as default but the configure stop
 # if news doesn't exist on the build host.
 # Use 'root' while cross-compiling