Just pushed a slightly modified fix.
https://github.com/bagder/curl/commit/14c3601583bfe171a33971115220378d5076e3b8
Thanks for reporting.

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** [bugs:#1449] curl improperly removes non-numeric scope identifiers from IPv6 addresses**
**Status:** open-confirmed
**Created:** Mon Nov 10, 2014 01:01 PM UTC by Kyle
**Last Updated:** Tue Dec 09, 2014 12:02 AM UTC
**Owner:** Daniel Stenberg
Given "https://[fe80::1%en1]:8888/" curl incorrectly turns that into "https://[fe80::1]:88]:8888/" after removing the scope identifier and then tries to connect to port 88.
The bug also affects '%25' non-numeric scope names.  Numeric scope names are handled by a different branch of the code and work properly.
Patch attached here.  Could make it a GitHub pull request if preferred.
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