Update included popt to version 1.7

[Lapo Luchini]

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Paul Slootman wrote:

 >    checking for poptGetContext in -lpopt... yes
 >    checking whether to use included libpopt... no
 >
 >So dropping it from the rsync source tree might not be a bad thing.
 >
Same here, on cygwin:

2.5.6 release:
checking for poptGetContext in -lpopt... yes
checking whether to use included libpopt... no

latest "cyberone" no build.samba.org:
checking for poptGetContext in -lpopt... yes
checking whether to use included libpopt... no

Moreover at least 3 cygwin packages use popt so "it does have a sense" to
have an indipendent popt.
(I also use it for a couple of projects, I love popt ^_^)

- --
Lapo 'Raist' Luchini
lapo at lapo.it (PGP & X.509 keys available)
http://www.lapo.it (ICQ UIN: 529796)


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