Revert "Implement -e trace=%sched option"

Revert "Implement -e trace=%sched option"

-e trace=%sched became redundant as -e trace=/sched does the same.

This reverts commit 811638e9c1805438a63c14f9704b8b00ac922623.

* syscall.c (TSC): Remove.
* sysent.h (TRACE_SCHED): Remove.
* qualify.c (lookup_class): Remove %sched.
* strace.1 (.SS Filtering): Likewise.
* NEWS: Likewise.
* linux/32/syscallent.h: Remove TSC flag from sched* syscalls.
* linux/64/syscallent.h: Likewise.
* linux/alpha/syscallent.h: Likewise.
* linux/arm/syscallent.h: Likewise.
* linux/avr32/syscallent.h: Likewise.
* linux/bfin/syscallent.h: Likewise.
* linux/crisv10/syscallent.h: Likewise.
* linux/hppa/syscallent.h: Likewise.
* linux/i386/syscallent.h: Likewise.
* linux/ia64/syscallent.h: Likewise.
* linux/m68k/syscallent.h: Likewise.
* linux/microblaze/syscallent.h: Likewise.
* linux/mips/syscallent-n32.h: Likewise.
* linux/mips/syscallent-n64.h: Likewise.
* linux/mips/syscallent-o32.h: Likewise.
* linux/powerpc/syscallent.h: Likewise.
* linux/powerpc64/syscallent.h: Likewise.
* linux/s390/syscallent.h: Likewise.
* linux/s390x/syscallent.h: Likewise.
* linux/sh/syscallent.h: Likewise.
* linux/sh64/syscallent.h: Likewise.
* linux/sparc/syscallent.h: Likewise.
* linux/sparc64/syscallent.h: Likewise.
* linux/x32/syscallent.h: Likewise.
* linux/x86_64/syscallent.h: Likewise.
* linux/xtensa/syscallent.h: Likewise.
* tests/sched.test: Replace trace=%sched with trace=/sched.
* tests/ksysent.c (TSC): Remove.
* tests/nsyscalls.c: Likewise.