Allow configuring the path to the SSL CA certs
Track Rust master
Allow configuring CAINFO
Add verbose flag
Fix deprecated warnings
Fix failing proxy test

The server expected to receive a trailing forward-slash in the URL being
posted from curl.
Tweak how curl-rust links to libcurl
Import curl 7.37.1 for static builds (if necessary)
Configure a cargo package to build libcurl
Remove a curl-generated file
Tweak the makefile to work everywhere hopefully
Fix the build on mingw
Actually link to link-config
Force LF endings in libcurl
Abandon make install as it doesn't work on windows
Fix deprecation warnings