[appveyor] Trying to fix autotools on mingw

CMakeLists.txt

@@ -31,13 +31,13 @@ cr_add_subproject (nanomsg
   PATH dependencies/nanomsg-patched
   OPTS "-DNN_TESTS=OFF"
   CMAKE
-  IF MSVC
+  IF WIN32 AND NOT CYGWIN
 )
 cr_add_subproject (nanomsg
   PATH dependencies/nanomsg-patched
   AUTOTOOLS
   PARALLELIZE
-  IF NOT MSVC
+  IF NOT WIN32 OR CYGWIN
 )
 
 cr_add_subproject (wingetopt PATH dependencies/wingetopt CMAKE IF MSVC)

appveyor.yml

@@ -5,7 +5,6 @@ os: Visual Studio 2015
 init:
   - git config --global core.autocrlf input
   - 'SET PATH=C:\MinGW\bin;%PATH%;C:\MinGW\msys\1.0\bin;%APPVEYOR_BUILD_FOLDER%\build;%APPVEYOR_BUILD_FOLDER%\build\Debug;%APPVEYOR_BUILD_FOLDER%\build\external\bin;%APPVEYOR_BUILD_FOLDER%\build\external\lib'
-  - mingw-get install libtool
 
 environment:
   COVERALLS_REPO_TOKEN: