package/softhsm2: requires DES support in openssl

Fix the following build failure raised since the addition of the package
in commit 53873b6daecd2a97740833cae7c5b4cdb185a6b2:

OSSLDES.cpp: In member function 'virtual const EVP_CIPHER* OSSLDES::getCipher() const':
OSSLDES.cpp:81:12: error: 'EVP_des_cbc' was not declared in this scope; did you mean 'EVP_sm4_cbc'?
   81 |     return EVP_des_cbc();
      |            ^~~~~~~~~~~
      |            EVP_sm4_cbc

Fixes:
 - http://autobuild.buildroot.org/results/27d471c4ad1cdd5f2332b949f71cba86723d349f

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/softhsm2/Config.in

@@ -5,6 +5,7 @@ config BR2_PACKAGE_SOFTHSM2
 	depends on !BR2_STATIC_LIBS # dlopen()
 	select BR2_PACKAGE_OPENSSL
 	select BR2_PACKAGE_OPENSSL_FORCE_LIBOPENSSL
+	select BR2_PACKAGE_LIBOPENSSL_ENABLE_DES
 	help
 	  SoftHSM is an implementation of a cryptographic store
 	  accessible through a PKCS#11 interface. You can use it