JDK 9 RFR of JDK-8032977: Add serial lint warning to build of jdk repository

[Joe Darcy]

Hello,

With "cast", "static", and "overloads" lint warnings getting enabled in 
the build in JDK 9, next up will be "serial". For a future time when the 
library code is clean of serial warnings, work being tracked under 
JDK-8032976 Fix serial lint warnings in client libraries , please review 
the patch below to address

     JDK-8032977: Add serial lint warning to build of jdk repository

Thanks,

-Joe

diff -r 295785eb9e65 make/Setup.gmk
--- a/make/Setup.gmk    Tue Jan 28 17:22:07 2014 -0800
+++ b/make/Setup.gmk    Wed Jan 29 10:09:18 2014 -0800
@@ -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,auxiliaryclass,cast,classfile,dep-ann,divzero,empty,overloads,static,try,varargs 
-Werror
+JAVAC_WARNINGS := 
-Xlint:-unchecked,-deprecation,-overrides,auxiliaryclass,cast,classfile,dep-ann,divzero,empty,overloads,serial,static,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