Implement -e trace=%sched option for tracing sched_* syscalls

Implement -e trace=%sched option for tracing sched_* syscalls

Based on the patch by Md Haris Iqbal
(https://sourceforge.net/p/strace/mailman/message/35111320/)

linux/*/syscallent.h part is modified automatically by:

    git grep -Fl 'SEN(sched_' linux/ | xargs sed -i \
        's/0\(,[[:space:]]*SEN(sched_\)/TSC\1/'

* sysent.h (TRACE_SCHED): New definition.
* syscall.c: Alias TSC to TRACE_SCHED around syscallent.h inclusion.
* linux/32/syscallent.h: Add TSC flag for sched_* sycalls.
* 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.
* qualify.c (lookup_class): Add TRACE_SCHED for "%sched".
* tests/ksysent.c: Define TSC to 0.
* tests/nsyscalls.c: Likewise.
* tests/sched.test: New test.
* tests/Makefile.am (DECODER_TESTS): Add sched.test.
* strace.1 (.SS Filtering): Add information about %sched syscall class.
* NEWS: Mention this change.

Co-authored-by: Md Haris Iqbal <haris.phnx@gmail.com>