Remove cygwin from Appveyor build

appveyor.yml

@@ -9,7 +9,6 @@ platform: x64
 environment:
   matrix:
   - TOOLCHAIN: "msvc"
-  - TOOLCHAIN: "cygwin"
 
 skip_tags: true
 
@@ -34,23 +33,9 @@ for:
     except:
       - TOOLCHAIN: "msvc"
 
-  build_script:
-  - ps: |
-      if ($env:TOOLCHAIN -eq "cygwin")
-      {
-        C:\cygwin64\setup-x86_64.exe -qnNdO -s http://cygwin.mirror.constant.com -l C:/cygwin64/var/cache/setup -P libiconv-devel -P ragel -P zlib-devel
-        C:\cygwin64\bin\sh -lc "cd /cygdrive/c/projects/readstat && ./autogen.sh"
-        C:\cygwin64\bin\sh -lc "cd /cygdrive/c/projects/readstat && ./configure"
-        C:\cygwin64\bin\sh -lc "cd /cygdrive/c/projects/readstat && make"
-      }
-
 test_script:
   - ps: |
-      if ($env:TOOLCHAIN -eq "cygwin")
-      {
-        C:\cygwin64\bin\sh -lc "cd /cygdrive/c/projects/readstat && make check"
-      }
-      else
+      if ($env:TOOLCHAIN -eq "msvc")
       {
         $state = "PASS"
         $tests = @("readstat","double_decimals","sav_date","dta_days")
@@ -79,10 +64,3 @@ test_script:
           exit 1
         }
       }
-
-on_success:
-  - ps: |
-      if ($env:TOOLCHAIN -eq "cygwin")
-      {
-        C:\cygwin64\bin\sh -lc "cd /cygdrive/c/projects/readstat && cat ./test-suite.log"
-      }