libbsd: Conditional compilation of tests

[Kinsey Moore]

Currently debugger01 is the only user of the test-if-library in libbsd 
and it doesn't seem to work as expected. The configure step that detects 
libdebugger occurs and succeeds as it should for the zynq a9 qemu BSP, 
but debugger01.exe never gets compiled. I found this behavior while 
working on the implementation for libdebugger for AArch64. Is there some 
configuration that I'm missing to actually enable that test? Changing it 
to an unconditional test yields a successfully compiled debugger01.exe.

Perhaps someone that has more familiarity with the waf configure scripts 
can tell me what I'm missing.


Thanks,

Kinsey