[patch] don't check for javac when not in java-maintainer mode

[Matthias Klose]

Andrew Haley schrieb:
> Matthias Klose writes:
> 
>  > We don't need a javac, when not confiured with
>  > --enable-java-maintainer-mode,
> 
> Sure we do: how else is the installed gcj to work?

AFAIU the point of checking in all .class and .h files is to build *without* a
javac on the system. So why check it at configure time and let the build fail?
How to build the first gij on such a system? The installed gcj will work with
the ecj.jar which you are required to get with a separate download anyway.