libc: minimal: Add empty sys/cdefs.h

This header is included by some files provided by ESP-IDF.  Nothing
from this header file is actually used: it's only being added allow
things to compile with the minimal libc.

Signed-off-by: Leandro Pereira <leandro.pereira@intel.com>
This commit is contained in:
Leandro Pereira 2017-05-03 15:10:15 -07:00 committed by Anas Nashif
commit 07d8ef008a

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