third-party: download: retry (#10599)

This is meant to handle the common case of failing to download
libtermkey:

    FAILED: cd /home/travis/build/neovim/neovim/deps-downloads/libtermkey && /usr/local/cmake-3.12.4/bin/cmake -DPREFIX=/home/travis/nvim-deps/build -DDOWNLOAD_DIR=/home/travis/build/neovim/neovim/deps-downloads/libtermkey -DURL=http://www.leonerd.org.uk/code/libtermkey/libtermkey-0.21.1.tar.gz -DEXPECTED_SHA256=cecbf737f35d18f433c8d7864f63c0f878af41f8bd0255a3ebb16010dc044d5f -DTARGET=libtermkey -DUSE_EXISTING_SRC_DIR=OFF -P /home/travis/build/neovim/neovim/third-party/cmake/DownloadAndExtractFile.cmake && /usr/local/cmake-3.12.4/bin/cmake -E touch /home/travis/nvim-deps/build/src/libtermkey-stamp/libtermkey-download
    -- file: /home/travis/build/neovim/neovim/deps-downloads/libtermkey/libtermkey-0.21.1.tar.gz
    -- downloading...
         src='http://www.leonerd.org.uk/code/libtermkey/libtermkey-0.21.1.tar.gz'
         dst='/home/travis/build/neovim/neovim/deps-downloads/libtermkey/libtermkey-0.21.1.tar.gz'
         timeout='none'
    CMake Error at /home/travis/build/neovim/neovim/third-party/cmake/DownloadAndExtractFile.cmake:77 (message):
      error: downloading
      'http://www.leonerd.org.uk/code/libtermkey/libtermkey-0.21.1.tar.gz' failed
        status_code: 6
        status_string: "Couldn't resolve host name"
        log: Curl_ipv4_resolve_r failed for www.leonerd.org.uk
      Couldn't resolve host 'www.leonerd.org.uk'
      Closing connection 0

Co-Authored-By: Justin M. Keyes <justinkz@gmail.com>

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