JDK-8218268: Javac treats Manifest Class-Path entries as Paths instead of URLs

[Jonathan Gibbons]

Please review a small change to javac, to use java.net.URL instead of 
java.nio.file.Path to evaluate the Class-Path in a JAR-file manifest.

There is no test because:

  * the change mirrors a corresponding change in
    jdk.internal.loader.URLClassPath
  * the change is simple
  * it would be complicated to set up a multi-platform multi-protocol test

The change is a subset of the code in URLClassPath (just the 
`tryResolveFile` method) because javac only supports the use of local 
JAR files (and not JAR files accessed by other URL protocols.)

-- Jon

JBS: https://bugs.openjdk.java.net/browse/JDK-8218268
Webrev: http://cr.openjdk.java.net/~jjg/8218268/webrev/

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