Fix sysdeps/unix/sysv/linux/arm/libc-do-syscall.S warning

[Mike Frysinger]

On 26 Nov 2014 15:14, Joseph Myers wrote:
> This patch fixes a warning
> 
> ../include/features.h:328:4: warning: #warning _FORTIFY_SOURCE requires compiling with optimization (-O) [-Wcpp]
> 
> seen when building for ARM.  This warning comes from libc-do-syscall.S
> being built for nscd: the nscd build uses _FORTIFY_SOURCE, while .S
> files aren't built with -O, and the combination produces a warning.
> As _FORTIFY_SOURCE doesn't do anything for .S files, undefining it in
> libc-do-syscall.S seems the simplest solution.

should we update features.h to avoid that define when __ASSEMBLER__ is defined ?
seems like this warning can impact external code too.
-mike
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