Android CI often fails at downloading the libxslt sources

[Lubomir I. Ivanov]

+ wget ftp://xmlsoft.org/libxml2/libxslt-1.1.29.tar.gz
--2018-03-15 21:53:00--  ftp://xmlsoft.org/libxml2/libxslt-1.1.29.tar.gz
           => 'libxslt-1.1.29.tar.gz'
Resolving xmlsoft.org (xmlsoft.org)... 91.121.203.120
Connecting to xmlsoft.org (xmlsoft.org)|91.121.203.120|:21... connected.
Logging in as anonymous ... Logged in!
==> SYST ... done.    ==> PWD ... done.
==> TYPE I ... done.  ==> CWD (1) /libxml2 ... done.
==> SIZE libxslt-1.1.29.tar.gz ... 3428524
==> PASV ... done.    ==> RETR libxslt-1.1.29.tar.gz ...
Error in server response, closing control connection.
Retrying.

and the above gets repeated multiple times.

maybe we should make a copy on a more stable server?

lubomir
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