uacme: add libev dependency to uacme-ualpn

The dependency has a PACKAGE_uacme-ualpn condition so that libev won't
be unnecessarily built if uacme-ualpn is not selected.

Remove PKG_USE_MIPS16:=0, as it is not necessary when not using the
libev that is bundled with uacme.

Signed-off-by: Eneas U de Queiroz <cotequeiroz@gmail.com>
(cherry picked from commit 1642b68d45)

net/uacme/Makefile

@@ -53,7 +53,7 @@ endef
 
 define Package/uacme-ualpn
   $(call Package/uacme/Default)
-  DEPENDS:=+uacme
+  DEPENDS:=+uacme +PACKAGE_uacme-ualpn:libev
   TITLE:=ualpn for uacme
   URL:=https://github.com/ndilieto/uacme
 endef