MinGW portability fix #2

[Hans Leidekker]

My previous patch used the autoconf macro AC_CHECK_DECL to check for a
getpagesize() declaration but on closer inspection it didn't seem to do
what it's supposed to do. At least not on my installation. This new patch
uses a custom configure check instead.

> 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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