Use of strcasestr

[Tomas Carnecky]

In 4fd9ea0 (guess From address from Received headers, 2010-04-06) you 
introduced strcasestr, which is not portable, see 82e47ec (notmuch 
reply: Use strstr instead of strcasestr for portability., 2010-02-04).

Is strcasestr really necessary there or can it be replaced with strstr?
tom

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