MinGW portability fix

[Hans Leidekker]

The configure check for getpagesize() succeeds on MinGW but
since MinGW has no function declaration for getpagesize(), many
files fail to compile. This patch adds a configure check for the
declaration and uses it to conditionally declare getpagesize().

Changelog:
  Add configure check for getpagesize() declaration, needed by MinGW.
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