[pg-cvs] Patch for Linux mremap

[John Fremlin]

Hi Stelian and Luis,

The Linux mremap call is missing from Osicat. It's quite handy and
offers a nicer way of extending a mapping (possibly after ftruncate)
than munmap/mmap.

Please review and apply. Note that the unfortunate _GNU_SOURCE addition
is necessary!

(Using it for a replacement for anardb with mmap'd databases.)

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