[build] remove support for Java 8 in go.bat

Author: titusfortner

go.bat

@@ -1,12 +1,10 @@
 @echo off
 SETLOCAL
 
-SET JAVA_OPTS=-client -Xmx4096m -XX:ReservedCodeCacheSize=512m
+REM we want jruby-complete to take care of all things ruby
+SET GEM_HOME=
+SET GEM_PATH=
 
-for /f tokens^=2-5^ delims^=.-_^" %%j in ('java -fullversion 2^>^&1') do set "jver=%%j.%%k"
-IF "%jver%" == "1.8" GOTO :start
+SET JAVA_OPTS=-client -Xmx4096m -XX:ReservedCodeCacheSize=512m --add-modules java.se --add-opens java.base/java.lang=ALL-UNNAMED --add-opens java.base/java.io=ALL-UNNAMED --add-opens java.base/java.lang.reflect=ALL-UNNAMED --add-opens java.base/javax.crypto=ALL-UNNAMED
 
-SET JAVA_OPTS=%JAVA_OPTS% --add-modules java.se --add-opens java.base/java.lang=ALL-UNNAMED --add-opens java.base/java.io=ALL-UNNAMED --add-opens java.base/java.lang.reflect=ALL-UNNAMED --add-opens java.base/javax.crypto=ALL-UNNAMED
-
-:start
 java %JAVA_OPTS% -jar third_party\jruby\jruby-complete.jar -X-C -S rake %*