This is the version information for the manifests in the JAR files.

JAVACFLAGS (taken from ant debuglevel property):  @JAVACFLAGS@
Implementation_Version:                           @Implementation_Version@
Ant arguments:                                    @ant_args@

This file exists solely to trigger ant recompilation if it is needed.
Otherwise, JAR files and all the dependent files are brought from cache.
This file does not get installed or used in any other way other than
during the build process.