Build libssh without examples

Apparently, building the examples somehow attempts linking against
`libdl` that it can't locate. But we don't need them regardless.

Author: webknjaz

build-scripts/manylinux-container-image/install_libssh.sh

@@ -104,6 +104,7 @@ cmake "${LIB_CLONE_DIR}" \
     -DCLIENT_TESTING=OFF \
     -DSERVER_TESTING=OFF \
     -DUNIT_TESTING=OFF \
+    -DWITH_EXAMPLES=OFF \
     -DWITH_GSSAPI=ON \
     -DWITH_SERVER=OFF \
     -DWITH_PCAP=OFF \