Recommended update for curl

This update for curl fixes the following issue:

- Fix "Network is unreachable" error when ipv6 is not available but ipv4.
This fixes the same error in applications using libcurl4 (like zypper). (bsc#915846)

This update was imported from the SUSE:SLE-12:Update update project.

Fixed bugs
bnc#915846
Unable to connect to repositories
Selected Binaries
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