gnutls: handle libidn properly

Add it to the dependencies when it's available.
But disable crywrap when it's a nommu system since it uses fork()

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/gnutls/gnutls.mk

@@ -20,6 +20,10 @@ GNUTLS_INSTALL_STAGING = YES
 # libpthread autodetection poisons the linkpath
 GNUTLS_CONF_OPT += $(if $(BR2_TOOLCHAIN_HAS_THREADS),--with-libpthread-prefix=$(STAGING_DIR)/usr)
 
+# libidn support for nommu must exclude the crywrap wrapper (uses fork)
+GNUTLS_CONF_OPT += $(if $(BR2_USE_MMU),,--disable-crywrap)
+GNUTLS_DEPENDENCIES += $(if $(BR2_PACKAGE_LIBIDN),libidn)
+
 # Some examples in doc/examples use wchar
 define GNUTLS_DISABLE_DOCS
 	$(SED) 's/ doc / /' $(@D)/Makefile.in