[Spamassassin Wiki] Update of "CodingStyle" by JustinMason

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The following page has been changed by JustinMason:
http://wiki.apache.org/spamassassin/CodingStyle

The comment on the change is:
add style-guide entry about bug 4593

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  In our C code we took the easiest way and adopted the [http://www.apache.org/dev/styleguide.html Apache Developers' C Language Style Guide].
  
+ One addition, arising from [http://issues.apache.org/SpamAssassin/show_bug.cgi?id=4593 bug 4593]: if there are warnings about variables being signed/unsigned, caused by use of "int" types in system calls that accept "size_t" (or similar), it is better to *carefully* perform a cast in the call(s) to the specific system calls being warned about, instead of changing the type of variables on a global scale to be a "size_t".  Bug 4593 is a good example of how this can cause bugs as a side-effect due to -1 being used as an error indicator.
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