Remove C++ style comment.

Only define O_BINARY if it isn't already defined (who knows, there may be
some unix out there ...).
Now that O_BINARY is defined for all architectures we can remove some EMX
special cases.
Clean up a signal for consistency.
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git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/1.3.x@78322 13f79535-47bb-0310-9956-ffa450edef68