[Patch] ecj1 always fails with OpenJDK runtime.

[David Daney]

When ecj1 is run using the OpenJDK runtime, gcj -C always exits with a 
failure exit code (1) even though no diagnostics are issued.

I tracked the problem down to a difference in behavior between the 
libgcj and OpenJDK for java.util.ZipOutputStream. 
org/eclipse/jdt/internal/compiler/batch/GCCMain tries to create a zip 
stream with no files.  This succeeds under libgcj but fails under OpenJDK

My hackish fix is to always create an empty file named '.dummy' in the 
stream.  I don't know if this is completely safe, but it does allow me 
to successfully do a --enable-java-maintainer-mode build.

2009-03-26  David Daney  <ddaney@caviumnetworks.com>

	* org/eclipse/jdt/internal/compiler/batch/GCCMain.java (fail):
	print a stack trace.
	(getZipOutput,getDependencyOutput): Create an empty dummy entry.
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