package/c-icap: memcached code needs <crypt.h>

The memcached code of c-icap needs <crypt.h>, which is no longer
provided by glibc since glibc 2.39. So add some logic to add a
dependency on libxcrypt when needed.

Fixes:

  http://autobuild.buildroot.net/results/63b04f86bb8794b79d206659a883acef96dfebf0/

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Julien Olivain <ju.o@free.fr>

package/c-icap/Config.in

@@ -3,6 +3,9 @@ config BR2_PACKAGE_C_ICAP
 	depends on !BR2_STATIC_LIBS
 	depends on BR2_TOOLCHAIN_HAS_THREADS
 	depends on BR2_USE_MMU # fork()
+	# the libmemcached code uses <crypt.h>
+	select BR2_PACKAGE_LIBXCRYPT if \
+	       BR2_PACKAGE_LIBMEMCACHED && BR2_TOOLCHAIN_USES_GLIBC
 	help
 	  c-icap is an implementation of an ICAP server. It can be
 	  used with HTTP proxies that support the ICAP protocol to

package/c-icap/c-icap.mk

@@ -43,7 +43,7 @@ endif
 
 ifeq ($(BR2_PACKAGE_LIBMEMCACHED),y)
 C_ICAP_CONF_OPTS += --with-memcached
-C_ICAP_DEPENDENCIES += libmemcached
+C_ICAP_DEPENDENCIES += libmemcached $(if $(BR2_PACKAGE_LIBXCRYPT),libxcrypt)
 else
 C_ICAP_CONF_OPTS += --without-memcached
 endif