#317 Fix lzmasdk build on some bigendian arches

[Iain Lane]

This patch is by Florian Weimer. I grabbed it from Fedora, but it applies upstream too.

On some big-endian arches (where MY_CPU_NAME doesn't get set), there is a preprocessor syntax error. It results in build failures like this:

In file included from rar/../lzmasdk/Ppmd.h:8:0,
                 from rar/../lzmasdk/Ppmd7.h:12,
                 from rar/rar.h:10,
                 from rar/rar.c:4:
rar/../lzmasdk/CpuArch.h:177:18: error: #elif with no expression
   #elif MY_CPU_BE
                  ^
In file included from rar/../lzmasdk/Ppmd.h:8:0,
                 from rar/../lzmasdk/Ppmd7.h:12,
                 from rar/rar.h:10,
                 from rar/uncompress-rar.c:7:
rar/../lzmasdk/CpuArch.h:177:18: error: #elif with no expression
   #elif MY_CPU_BE
                  ^

I couldn't find out how to check out the code, so this is just the patch I'm uploading into Ubuntu. The latest lzmasdk release contains the bug too.

[Igor Pavlov]

I'll fix it.
Thanks!