8334391: JDK build should exclude *-files directories for Java source

[magicus]

We should always exclude doc-files and snippet-files when compiling java code. To generalize this, exclude all *-files directories.

(The usage of EXCLUDES and EXCLUDE_FILES is a bit weird. In essence, EXCLUDE_FILES prepends a % wildchar match to the filenames given, which we use here, while EXCLUDES matches only strict directory names in the path. These should probably be clarified/redesigned for more intuitive exclusion.)

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Issue

• JDK-8334391: JDK build should exclude *-files directories for Java source (Bug - P4)

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