ruby: unbreak host build after auto-host-deps change

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/ruby/ruby.mk

@@ -9,6 +9,7 @@ RUBY_SITE = ftp://ftp.ruby-lang.org/pub/ruby/1.9
 RUBY_AUTORECONF = YES
 HOST_RUBY_AUTORECONF = YES
 RUBY_DEPENDENCIES = host-ruby
+HOST_RUBY_DEPENDENCIES =
 RUBY_MAKE_ENV = $(TARGET_MAKE_ENV)
 RUBY_CONF_OPT = --disable-install-doc --disable-rpath
 HOST_RUBY_CONF_OPT = --disable-install-doc --with-out-ext=curses,readline