package/libcoap: enable required libopenssl options

libcoap unconditionally calls the (deprecated) ENGINE_* logic in
libopenssl resulting in a build failure when
!BR2_PACKAGE_LIBOPENSSL_ENGINES since commit
623d3bbe43e9193aa8e3395367d01af59071b859

libcoap also unconditionally uses PSK

Fixes: 623d3bbe43e9193aa8e3395367d01af59071b859
 - http://autobuild.buildroot.org/results/6bd3e1390cbbc59b9b3d030c2a401e45e9d173da
 - http://autobuild.buildroot.org/results/f243209454feed4f33f759786c2023c576a2cd3d

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/libcoap/Config.in

@@ -1,5 +1,7 @@
 config BR2_PACKAGE_LIBCOAP
 	bool "libcoap"
+	select BR2_PACKAGE_LIBOPENSSL_ENABLE_PSK if BR2_PACKAGE_LIBOPENSSL
+	select BR2_PACKAGE_LIBOPENSSL_ENGINES if BR2_PACKAGE_LIBOPENSSL
 	help
 	  libcoap is a C implementation of a lightweight
 	  application-protocol for devices that are constrained their