minimal: add switches and exit results

lib/libwebsockets.c

...xamples/client-server/minimal-ws-proxy/minimal-ws-proxy.c

...amples/http-client/minimal-http-client-certinfo/README.md

...nimal-http-client-certinfo/minimal-http-client-certinfo.c

...minimal-http-client-hugeurl/minimal-http-client-hugeurl.c

...mples/http-client/minimal-http-client-hugeurl/selftest.sh

...ent/minimal-http-client-multi/minimal-http-client-multi.c

...lient/minimal-http-client-post/minimal-http-client-post.c

minimal-examples/http-client/minimal-http-client/README.md

...les/http-client/minimal-http-client/minimal-http-client.c

minimal-examples/http-client/minimal-http-client/selftest.sh

...minimal-http-server-dynamic/minimal-http-server-dynamic.c

...nimal-http-server-form-get/minimal-http-server-form-get.c

...erver-form-post-file/minimal-http-server-form-post-file.c

...mal-http-server-form-post/minimal-http-server-form-post.c

...-server-libuv-foreign/minimal-http-server-libuv-foreign.c

...tp-server/minimal-http-server-libuv/minimal-http-server.c

...rver/minimal-http-server-multivhost/minimal-http-server.c

...-server/minimal-http-server-smp/minimal-http-server-smp.c

...-server/minimal-http-server-tls/minimal-http-server-tls.c