[patch] account for undefined or unavailable syscalls

[Bernhard Fischer]

Hi,

The attached patch fixes compilation failures when certain syscalls are
not available.

- exit_group was apparently unavailable for ARM with kernel 2.4
- socketcall and ipc may be turned off on purpose.

	*(linux/syscallent.h, syscall.c): Check if exit_group,
	socketcall, ipc syscalls are available.


Please apply.

PS: The attached patch is a slightly adjusted version of
http://buildroot.uclibc.org/cgi-bin/viewcvs.cgi/*checkout*/trunk/buildroot/package/strace/strace-undef-syscall.patch
that applies to 4.5.15 and 4.5.16
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