package/linux-tools: openssl dependency for x86_64 selftests

On x86_64, libssl is a dependency for kselftests. selftests/sgx depends on
it.  Thus, select it in "Config.in", and add it as a build dependency in
"linux-tool-selftests.mk.in".

Link: https://lore.kernel.org/buildroot/20220517224809.21f77949@gmx.net/
Suggested-by: Peter Seiderer <ps.report@gmx.net>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@iki.fi>
[yann.morin.1998@free.fr:
  - in .mk: change condition to be on package being selected
]
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
(cherry picked from commit de77516a2b3f8435df066cfc611b0eacfb61b02e)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/linux-tools/Config.in

@@ -98,6 +98,7 @@ config BR2_PACKAGE_LINUX_TOOLS_SELFTESTS
 	select BR2_PACKAGE_LIBCAP_NG
 	select BR2_PACKAGE_UTIL_LINUX
 	select BR2_PACKAGE_UTIL_LINUX_SCHEDUTILS # runtime (taskset)
+	select BR2_PACKAGE_OPENSSL if BR2_x86_64
 	help
 	  Build and install (to /usr/lib/kselftests) kernel selftests.
 

package/linux-tools/linux-tool-selftests.mk.in

@@ -16,7 +16,10 @@ SELFTESTS_ARCH=$(NORMALIZED_ARCH)
 endif
 endif
 
-SELFTESTS_DEPENDENCIES = libcap-ng popt
+SELFTESTS_DEPENDENCIES = \
+	libcap-ng \
+	popt \
+	$(if $(BR2_PACKAGE_OPENSSL),openssl)
 
 SELFTESTS_MAKE_FLAGS = \
 	$(LINUX_MAKE_FLAGS) \