RFR v5 - 8027634: Support @argfiles for java command-line tool

[Henry Jen]

Hi,

Another minor revision address comments, no real behavior changes except use 
JLI_StrCmp instead of JLI_StrCCmp in checkArg().

http://cr.openjdk.java.net/~henryjen/jdk9/8027634/v5/webrev/

Cheers,
Henry