package/p11-kit: libffi is optional, not mandatory

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

package/p11-kit/Config.in

@@ -3,7 +3,6 @@ config BR2_PACKAGE_P11_KIT
 	depends on !BR2_STATIC_LIBS
 	depends on BR2_USE_MMU
 	depends on BR2_TOOLCHAIN_HAS_THREADS
-	select BR2_PACKAGE_LIBFFI
 	select BR2_PACKAGE_LIBTASN1
 	help
 	  Provides a way to load and enumerate PKCS#11 modules.

package/p11-kit/p11-kit.mk

@@ -6,7 +6,7 @@
 
 P11_KIT_VERSION = 0.23.16.1
 P11_KIT_SITE = https://github.com/p11-glue/p11-kit/releases/download/$(P11_KIT_VERSION)
-P11_KIT_DEPENDENCIES = host-pkgconf libffi libtasn1
+P11_KIT_DEPENDENCIES = host-pkgconf libtasn1
 P11_KIT_INSTALL_STAGING = YES
 P11_KIT_CONF_OPTS = --disable-static
 P11_KIT_CONF_ENV = ac_cv_have_decl_program_invocation_short_name=yes \
@@ -20,4 +20,11 @@ else
 P11_KIT_CONF_OPTS += --without-trust-paths
 endif
 
+ifeq ($(BR2_PACKAGE_LIBFFI),y)
+P11_KIT_DEPENDENCIES += host-pkgconf libffi
+P11_KIT_CONF_OPTS += --with-libffi
+else
+P11_KIT_CONF_OPTS += --without-libffi
+endif
+
 $(eval $(autotools-package))