remove warnings

[Artem B. Bityuckiy]

Hello.

I usualy compile Newlib with -Wall flag and there are seferal annoying 
warnings. Attached patch removes some of them.

strptime.c - remve "implicit declaration" warnings for strlen, abort, 
isspace, etc.

-- 
Best Regards,
Artem B. Bityuckiy,
St.-Petersburg, Russia.
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