[PATCH] Add missing headers to fix implicit function defns

[Hans-Bernhard Bröker]

Am 16.01.2017 um 01:12 schrieb Pat Pannuto:
> A few files were missing headers for memset/malloc, likely missed
> because the files don't directly call the functions, rather they
> come in via macros in libc/include/sys/reent.h:

Shouldn't then <sys/reent.h> be including <string.h> and <stdlib.h> 
itself, to be done with it?

If a header defines macros which reference things provided by other 
headers, it should make sure those other things are known, i.e. it 
should include those other headers.