From: Arnd Bergmann <arnd@arndb.de>

sys32_select has seven mostly but not exactly identical versions, so
consolidate them as compat_sys_select.  Based on the ppc64 implementation,
which most closely resembles sys_select.  One bug that was not caught by LTP
has been fixed since the first version of this patch.

tested x86_64, ia64 and s390.