Problem: CMake dev warning related to CMP0022 on Win32

> cmake .. -DCMAKE_TOOLCHAIN_FILE="%VCPKG_ROOT%\scripts\buildsystems\vcpkg.cmake"

  Target "czmq" has an INTERFACE_LINK_LIBRARIES property which differs from
  its LINK_INTERFACE_LIBRARIES_DEBUG properties.

  INTERFACE_LINK_LIBRARIES:
  ws2_32;Rpcrt4;Iphlpapi;
  $<$<NOT:$<CONFIG:DEBUG>>:C:/vcpkg/installed/x86-windows/lib/libzmq-mt-4_3_2.lib>;
  $<$<CONFIG:DEBUG>:C:/vcpkg/installed/x86-windows/debug/lib/libzmq-mt-gd-4_3_2.lib>;
  C:/ProgramData/Anaconda3/Library/lib/libcurl.lib

  LINK_INTERFACE_LIBRARIES_DEBUG:
  ws2_32;Rpcrt4;Iphlpapi;
  C:/vcpkg/installed/x86-windows/debug/lib/libzmq-mt-gd-4_3_2.lib;
  C:/ProgramData/Anaconda3/Library/lib/libcurl.lib

This warning will disappear by upgrading the minimum required CMake version to 2.8.12.
(libzmq also sets minimum required version to 2.8.12)

Author: myd7349

zproject_cmake.gsl

@@ -19,7 +19,7 @@ $(project.GENERATED_WARNING_HEADER:)
 ########################################################################
 # Project setup
 ########################################################################
-cmake_minimum_required(VERSION 2.8.8)
+cmake_minimum_required(VERSION 2.8.12)
 project($(project.name:c))
 .if project.use_cxx
 enable_language(CXX)
@@ -151,7 +151,7 @@ find_package($(use.project) REQUIRED)
 IF ($(USE.PROJECT)_FOUND)
 .else
 find_package($(use.project))
-option($(PROJECT.PREFIX)_WITH_$(USE.PROJECT) "Build czmq with $(use.project)" ${$(USE.PROJECT)_FOUND})
+option($(PROJECT.PREFIX)_WITH_$(USE.PROJECT) "Build $(project.linkname) with $(use.project)" ${$(USE.PROJECT)_FOUND})
 IF ($(PROJECT.PREFIX)_WITH_$(USE.PROJECT) AND $(USE.PROJECT)_FOUND)
 .endif
 .if use.libname ?<> ""