RFR 8054461: Add @file support to sjavac

[Fredrik Öhrström]

The command line for building the jdk using sjavac is near the
Windows/Cygwin limits. Even though the OpenJDK is being cleaned up and the
command line is getting shorter, there are other projects that could need
long command lines due to their irregular source organization. Javac
already supports @files.

Please review the addition of @file support to sjavac.

http://cr.openjdk.java.net/~ohrstrom/webrev-8054461-atfile/

https://bugs.openjdk.java.net/browse/JDK-8054461

//Fredrik
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