RSB build issue with rtems-libbsd

[Vijay Kumar Banerjee]

Hello,

I'm getting the following error when trying to build rtems-libbsd from
RSB. Is there anything that I'm missing?

```
../source-builder/sb-set-builder --prefix=$RTEMS6_PREFIX
6/rtems-libbsd --host=powerpc-rtems6 --with-rtems-bsp=beatnik
RTEMS Source Builder - Set Builder, 6 (102cb1e6450f)
warning: exe: absolute exe found in path: (__chown) /usr/sbin/chown
Build Set: 6/rtems-libbsd
config: tools/rtems-libbsd-6.cfg
error: rtems-bsp.cfg:155: invalid %if operator:  -mcpu=7400
-I/home/vijay/development/rtems/6/powerpc-rtems6/beatnik/lib/include
==
Build FAILED
Build Set: Time 0:00:00.046141
Build FAILED

```

Commenting these checks from rtems-bsp.cfg gets it building.

Best regards,
Vijay