Removed 7zip installation from appveyor. It is pre-installed now.

redboltz · redboltz · commit e719cbbb7a56 · 2015-08-11T20:00:48.000+09:00
diff --git a/appveyor.yml b/appveyor.yml
@@ -1,6 +1,5 @@
 version: 1.1.0.{build}
 before_build:
-- cinst 7zip.commandline -x86 -y
 - appveyor DownloadFile http://googletest.googlecode.com/files/gtest-1.7.0.zip -FileName gtest-1.7.0.zip
 - 7z x gtest-1.7.0.zip > NUL
 - cd gtest-1.7.0
