Very small http parser tweak

[Nils Kuhnhenn]

The http parser performance for http methods that are 5 bytes long could be
improved a little by inserting 'break' after each 'r->method =...' in the
lines 212-224 in src/http/ngx_http_parse.c

>From looking at the other code it looks like someone just forgot to insert
them.

I'm on my phone right now so sorry for providing no diff.
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