lib/nolibc: Import sys/sysmacros.h

lib/nolibc: Import sys/sysmacros.h

Provides convenient macros for handling minor/major device numbers and
encoding these into a single dev_t.
Imported verbatim; checkpatch ignored.

Source of import:
Repository: git://git.musl-libc.org/musl
Tag: v1.2.4 (f5f55d65)
Path: include/sys/sysmacros.h

Checkpatch-Ignore: SPDX_LICENSE_TAG
Checkpatch-Ignore: MACRO_ARG_REUSE
Checkpatch-Ignore: UNSPECIFIED_INT
Checkpatch-Ignore: SPACING
Checkpatch-Ignore: CODE_INDENT
Checkpatch-Ignore: LEADING_SPACE
Signed-off-by: Andrei Tatar <andrei@unikraft.io>
Approved-by: Sergiu Moga <sergiu@unikraft.io>
Reviewed-by: Sergiu Moga <sergiu@unikraft.io>
GitHub-Closes: #1578