package/postgis: add optional pcre dependency

Signed-off-by: Peter Seiderer <ps.report@gmx.net>
Reviewed-by: Maxim Kochetkov <fido_max@inbox.ru>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>

package/postgis/postgis.mk

@@ -35,4 +35,8 @@ else
 POSTGIS_CONF_OPTS += --without-json
 endif
 
+ifeq ($(BR2_PACKAGE_PCRE),y)
+POSTGIS_DEPENDENCIES += pcre
+endif
+
 $(eval $(autotools-package))