openssl: conditionally disable engine section

Currently, the build option to enable/disable engine support isn't
reflected in the final '/etc/ssl/openssl.cnf' config. It assumes `engines`
is always enabled, producing an error whenever running any
commands in openssl util or programs that explicitly use settings
from '/etc/ssl/openssl.cnf'.

```
➤ openssl version
FATAL: Startup failure (dev note: apps_startup()) for openssl
307D1EA97F000000:error:12800067:lib(37):dlfcn_load:reason(103):crypto/dso/dso_dlfcn.c:118:filename(libengines.so):
Error loading shared library libengines.so: No such file or directory
307D1EA97F000000:error:12800067:lib(37):DSO_load:reason(103):crypto/dso/dso_lib.c:152:
307D1EA97F000000:error:0700006E:lib(14):module_load_dso:reason(110):crypto/conf/conf_mod.c:321:module=engines, path=engines
307D1EA97F000000:error:07000071:lib(14):module_run:reason(113):crypto/conf/conf_mod.c:266:module=engines
```

Build should check for the `CONFIG_OPENSSL_ENGINE` option, and comment out `engines`
if not explicitly enabled.

Example:
```
[openssl_init]
providers = provider_sect
```

After this change, openssl util works correctly.

```
➤ openssl version
OpenSSL 3.0.14 4 Jun 2024 (Library: OpenSSL 3.0.14 4 Jun 2024)
```

Signed-off-by: Sean Khan <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/15661
Signed-off-by: Robert Marko <[email protected]>

package/libs/openssl/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=openssl
 PKG_VERSION:=3.0.14
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 PKG_BUILD_FLAGS:=no-mips16 gc-sections no-lto
 
 PKG_BUILD_PARALLEL:=1
@@ -416,6 +416,8 @@ define Package/libopenssl-conf/install
 	$(INSTALL_BIN) ./files/openssl.init $(1)/etc/init.d/openssl
 	$(SED) 's!%ENGINES_DIR%!/usr/lib/$(ENGINES_DIR)!' $(1)/etc/init.d/openssl
 	touch $(1)/etc/config/openssl
+	$(if $(CONFIG_OPENSSL_ENGINE),,
+		$(SED) 's!engines = engines_sect!#&!' $(1)/etc/ssl/openssl.cnf)
 	$(if $(CONFIG_OPENSSL_ENGINE_BUILTIN_DEVCRYPTO),
 		$(CP) ./files/devcrypto.cnf $(1)/etc/ssl/modules.cnf.d/
 		echo -e "config engine 'devcrypto'\n\toption enabled '1'\n\toption builtin '1'" >> $(1)/etc/config/openssl)