openssl: fix variable reference in conffiles

Fix the trivial abscence of $() when assigning engine config files to
the main libopenssl-config package even if the corresponding engines
were not built into the main library.

This is mostly cosmetic, since scripts/ipkg-build tests the file's
presence before it is actually included in the package's conffiles.

Fixes: 30b0351039 "openssl: configure engine packages during install"
Signed-off-by: Eneas U de Queiroz <[email protected]>

package/libs/openssl/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=openssl
 PKG_VERSION:=3.0.8
-PKG_RELEASE:=3
+PKG_RELEASE:=4
 PKG_USE_MIPS16:=0
 
 PKG_BUILD_PARALLEL:=1
@@ -128,8 +128,8 @@ endef
 
 define Package/libopenssl-conf/conffiles
 /etc/ssl/openssl.cnf
-$(if CONFIG_OPENSSL_ENGINE_BUILTIN_DEVCRYPTO,/etc/ssl/engines.cnf.d/devcrypto.cnf)
-$(if CONFIG_OPENSSL_ENGINE_BUILTIN_PADLOCK,/etc/ssl/engines.cnf.d/padlock.cnf)
+$(if $(CONFIG_OPENSSL_ENGINE_BUILTIN_DEVCRYPTO),/etc/ssl/engines.cnf.d/devcrypto.cnf)
+$(if $(CONFIG_OPENSSL_ENGINE_BUILTIN_PADLOCK),/etc/ssl/engines.cnf.d/padlock.cnf)
 endef
 
 define Package/libopenssl-conf/description