[PATCH]Add include guard to sparc.h when using assembly

[Mohammed Khoory]

Hi,

While working on a LEON3-based application, I was writing an assembly file
and so I included <rtems/asm.h> in order to use macros like PUBLIC() and
SYM(). When I tried to assemble my file (with sparc-rtems4.10-as) I got a
lot of "unknown opcode: typedef" errors. Looking at the headers I noticed
that it was including sparc.h, which has a bunch of typedefs. 

This tiny patch fixes this problem by adding an #ifndef ASM around the
sparc.h include line. 

If there are any comments let me know.

Regards,
Mohammed Khoory
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