[libjava] Cleanup automake conditionals (part 2)

[Kelley Cook]

For all the conditional sources for libgcj, we were defining a new 
variable with either an additional sourcefile or a null string when we 
could have just appended the additional sources to libgcj_la_SOURCES, 
which makes it clearer to see the intended build logic.

Bootstrapped and regtested i686-pc-gnu-linux (actually the stripped 
libraries are identical).

OK?
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