basic: move basic/missing_syscall_defs.h -> include/override/sys/syscall.h

This also moves syscall tables and generators to the same directory.

Note, inclusion of asm/sgidefs.h is dropped, as it is already included
by unistd.h and sys/syscall.h.

src/basic/meson.build

@@ -121,9 +121,6 @@ sources += basic_sources
 
 missing_audit_h = files('missing_audit.h')
 
-missing_syscall_def_h = files('missing_syscall_def.h')
-basic_sources += missing_syscall_def_h
-
 generated_gperf_headers = []
 foreach item : [
         # name,    source,         struct name,  prefix,    headers
@@ -176,50 +173,6 @@ basic_sources += generated_gperf_headers
 
 ############################################################
 
-arch_list = [
-        'alpha',
-        'arc',
-        'arm',
-        'arm64',
-        'i386',
-        'ia64',
-        'loongarch64',
-        'm68k',
-        'mips64',
-        'mips64n32',
-        'mipso32',
-        'parisc',
-        'powerpc',
-        'powerpc64',
-        'riscv32',
-        'riscv64',
-        's390',
-        's390x',
-        'sparc',
-        'x86_64'
-]
-
-run_target(
-        'update-syscall-tables',
-        command : [update_syscall_tables_sh, meson.current_source_dir()] + arch_list)
-
-syscall_list_txt = files('syscall-list.txt')
-
-syscall_lists = []
-foreach arch: arch_list
-        syscall_lists += files('syscalls-@0@.txt'.format(arch))
-endforeach
-
-missing_syscalls_py = find_program('missing_syscalls.py')
-
-run_target(
-        'update-syscall-header',
-        command : [missing_syscalls_py,
-                   missing_syscall_def_h,
-                   syscall_lists])
-
-############################################################
-
 filesystem_includes = files(
         '../include/uapi/linux/magic.h',
         'missing_magic.h',