Don't try to link against libuv on hurd.

Closes: #844374

debian/changelog

@@ -1,6 +1,7 @@
 cmake (3.7.1-1) UNRELEASED; urgency=medium
 
   * New upstream release.
+  * Don't try to link against libuv on hurd. (Closes: #844374)
 
  -- Felix Geyer <fgeyer@debian.org>  Sat, 03 Dec 2016 23:29:01 +0100
 

debian/rules

@@ -32,6 +32,9 @@ $(BUILD_FLAGS_FILE) verify-build-flags:
 ifeq ($(filter stage1,$(DEB_BUILD_PROFILES)),)
 	$(call $(flag_action),BUILD_QtDialog,ON,"Build Qt GUI")
 endif
+ifeq ($(DEB_HOST_ARCH_OS),hurd)
+	$(call $(flag_action),CMAKE_USE_LIBUV,0,"Do not use libuv")
+endif
 #	$(call $(flag_action),BUILD_DOCUMENTATION,ON)
 
 $(BUILD_FLAGS_FILE): flag_action := set_build_flag