RFR: 8191420: Changing "requires" to "requires static" in an application module results in build failure

[Erik Joelsson]

Hello,

This is a small fix to the module-info.java parsing logic in make to add 
support for the "requires static" construct. I also made the current 
logic a bit more robust so that it only matches keywords as stand alone 
words.

Webrev: http://cr.openjdk.java.net/~erikj/8191420/webrev.01/

Bug: https://bugs.openjdk.java.net/browse/JDK-8191420

/Erik