[crossfire] Update to svn:externals in /stable

[Rick Tanner]

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Earlier today in Revision:19035, the old 1.11 branch was removed with
the following message:

"This was used as trunk for the 1.x branch during the days where a 2.x
release seemed imminent. Changes were merged into trunk a long time
ago and has served it's purpose."

This caused problems with the external reference in /stable - such as:

svn: warning: W200000: Error handling externals definition for
'stable/client':
svn: warning: W170000: URL
'https://svn.code.sf.net/p/crossfire/code/client/branches/1.11' at
revision 19035 doesn't exist

To correct this, I updated the external reference for /stable to use
the 1.70.0 tags release.  This was in Revision:19036 which was also
made today, 2013-sept-12.

If anyone has any questions, problems, suggestions, disputes - please
follow up to this email thread for further help or discussion.

Thank you,

- - Rick Tanner
leaf at real-time.com

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