Remove code which is not used on Linux

Compile tested in qemu on armv4l,armv4tl,armv5l,armv6l,i686,
mipsel,mips,x86_64

* syscall.c: Remove code which handles RVAL_Lfoo constants.
* defs.h: Remove struct tcb::u_lrval member - it is never set.
Remove RVAL_Lfoo constants which signify return of "long" result -
they are never used.

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2 files changed