oops, fix typo in [12368]

SVN-Revision: 12369

package/ppp/Makefile

@@ -124,7 +124,7 @@ endef
 define Build/InstallDev
 	$(INSTALL_DIR) $(1)/usr/include
 	$(CP) $(PKG_INSTALL_DIR)/usr/include/pppd $(1)/usr/include/
-endif
+endef
 
 define Package/ppp/install
 	$(INSTALL_DIR) $(1)/usr/lib/pppd/$(PKG_VERSION)