Fixed Issue #140: "opcache.enable_file_override" doesn't respect "opcache.revalidate_freq"
Added suggestion about opcache.revalidate_freq setting in development environment
removed outdated IsDebuggerPresent declaration

This piece of code seems to retain compatibility with some windows
versions before 2000. Today it's not relevant anymore and only
produces a warning C4273 because of the conflicting prototype. In
VC9 the declaration is present in winbase.h:4142, but available
is it already in winxp. Here's the doc link
http://msdn.microsoft.com/en-us/library/windows/desktop/ms680345(v=vs.85).aspx
Merge branch 'PHP-5.4' into PHP-5.5

* PHP-5.4:
  removed outdated IsDebuggerPresent declaration