libftdi: add host variant

[Peter: remove redundant HOST_LIBFTDI_DEPENDENCIES]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Acked-by: Luca Ceresoli <luca@lucaceresoli.net>
Acked-by: Thomas De Schampheleire <thomas.de.schampheleire@gmail.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/libftdi/libftdi.mk

@@ -21,3 +21,4 @@ LIBFDTI_CONF_OPT += --disable-libftdipp
 endif
 
 $(eval $(call AUTOTARGETS))
+$(eval $(call AUTOTARGETS,host))