Update p7zip to version 4.51

[Simon Ruderich]

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Hi,

could you please update the Portfile for p7zip to version 4.51. I
attached a patch for this. It works fine for me.

Simon
- --
+ privacy is necessary
+ using http://gnupg.org
+ public key id: 0x6115F804EFB33229
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Version: GnuPG v1.4.7 (Darwin)

iD8DBQFGr2MmYRX4BO+zMikRCg0lAJ4vdDKLoPJE0hUqU8CMP/o8YjhKpwCeI02T
6Ippa9+V8D557eVvtSptElU=
=NJG5
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-------------- next part --------------
5c5
< version          4.47
---
> version          4.51
19,21c19,21
< checksums        md5 76f486aa882638f1c259cd8d810adf6c \
<                  sha1 568abf5571fe92c18798feb582604c0f5563a6b0 \
<                  rmd160 7bb770ad4f721bdc024052e24d9c5fbb1bc3c04c
---
> checksums        md5 d7f310fdb530cc1259d7b7ca28162747 \
>                  sha1 e3708dc69ec44dba554ab15d0cacbc226eae9420 \
>                  rmd160 af57615cc9d951516891a3f52b169f3d7c262650
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