[libjava] Cleanup automake conditionals (part 1)

[Bryce McKinlay]

Kelley Cook wrote:

> This is a multi part patch to clean up the uses of AM_CONDITIONALs in 
> libjava.
>
> The first one is the only one that might be controversial, though it 
> does not change any functionality.  It is required for the next step.
>
> This simply merges the am_conditional USING_ECOS_PLATFORM into 
> USING_POSIX_PLATFORM as they both do the same thing in Makefile.am.
>
> Specifically, USING_ECOS_PLATFORM is referred to exactly once in the 
> libjava sources; if true it adds posix.cc into libgcj.  While, 
> USING_POSIX_PLATFORM is also referred to exactly once in the libjava 
> sources; if true it also adds posix.cc into libgcj.
>
>
> Bootstrapped and regtested on i686-pc-gnu-linux, OK to install?


OK

Bryce