8024603: Turn on javac lint checking for auxiliaryclass, empty, and try in jdk build

Reviewed-by: erikj, ihse, chegar
diff --git a/jdk/makefiles/Setup.gmk b/jdk/makefiles/Setup.gmk
index b624afb..d2e706f 100644
--- a/jdk/makefiles/Setup.gmk
+++ b/jdk/makefiles/Setup.gmk
@@ -27,7 +27,7 @@
 
 # To build with all warnings enabled, do the following:
 # make JAVAC_WARNINGS="-Xlint:all -Xmaxwarns 10000"
-JAVAC_WARNINGS := -Xlint:-unchecked,-deprecation,-overrides,classfile,dep-ann,divzero,varargs -Werror
+JAVAC_WARNINGS := -Xlint:-unchecked,-deprecation,-overrides,auxiliaryclass,classfile,dep-ann,divzero,empty,try,varargs -Werror
 
 # Any java code executed during a JDK build to build other parts of the JDK must be 
 # executed by the bootstrap JDK (probably with -Xbootclasspath/p: ) and for this