[Xenomai-core] Xenomai broken on Linux 2.4

[Wolfgang Grandegger]

Hi Philippe,

I just realized that recent changes in ksrc/arch/powerpc/switch.S have 
broken the build of Xenomai with linuxppc_2_4_devel on PPC:

 #include <asm/offsets.h> does not exist
 Symbols like SAVE_NVGPRS do not exist

For the time being, I will stick with an older version for testing RTnet 
(where I'm currently debugging "floating point used in kernel" errors on 
the MPC8260),

Thanks.

Wolfgang.