package/dropbear: add optional dependency to libxcrypt

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

Due to this removal dropbear was unable to accept connections using
password authentication.

Signed-off-by: Bernd Kuhls <bernd@kuhls.net>
Tested-by: James Hilliard <james.hilliard1@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/dropbear/Config.in

@@ -2,6 +2,7 @@ config BR2_PACKAGE_DROPBEAR
 	bool "dropbear"
 	select BR2_PACKAGE_ZLIB if !BR2_PACKAGE_DROPBEAR_SMALL
 	select BR2_PACKAGE_LIBTOMCRYPT if !BR2_PACKAGE_DROPBEAR_SMALL
+	select BR2_PACKAGE_LIBXCRYPT if BR2_TOOLCHAIN_USES_GLIBC
 	help
 	  A small SSH 2 server designed for small memory environments.
 

package/dropbear/dropbear.mk

@@ -36,6 +36,10 @@ ifeq ($(BR2_SHARED_STATIC_LIBS),y)
 DROPBEAR_CONF_OPTS += --disable-static
 endif
 
+ifeq ($(BR2_PACKAGE_LIBXCRYPT),y)
+DROPBEAR_DEPENDENCIES += libxcrypt
+endif
+
 ifeq ($(BR2_PACKAGE_LINUX_PAM),y)
 define DROPBEAR_SVR_PAM_AUTH
 	echo '#define DROPBEAR_SVR_PASSWORD_AUTH 0'     >> $(@D)/localoptions.h