travis: use custom libssh2-1-dev package To avoid pull requests needing to rebase, keep the libssh2-1-dev package as the development package for libssh2. Reverting to the original Debian package structure.
diff --git a/.travis.yml b/.travis.yml
index 242f3b6..a4c8e91 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -34,7 +34,7 @@ addons:
libcurl3
libcurl3-gnutls
libcurl4-gnutls-dev
- libssh2-1
+ libssh2-1-dev
openssh-client
openssh-server
valgrind