cut out dangerous lua libs in server

appveyor.yml

@@ -14,9 +14,7 @@ install:
   - move libevent-2.0.22-stable event
   - xcopy /E event\WIN32-Code event\include
   
-  - bash -c "curl --retry 5 --connect-timeout 30 --location --remote-header-name --remote-name https://www.lua.org/ftp/lua-5.3.5.tar.gz ; exit 0"
-  - tar xf lua-5.3.5.tar.gz
-  - move lua-5.3.5\src lua
+  - git clone --depth=1 --branch=cut https://github.com/purerosefallen/lua
   
   - bash -c "curl --retry 5 --connect-timeout 30 --location --remote-header-name --remote-name https://www.sqlite.org/2018/sqlite-amalgamation-3240000.zip ; exit 0"
   - 7z x -y sqlite-amalgamation-3240000.zip