Does not work with modern openssl versions

[janderholm]

acme-client depends on an old version of reqwest which in turn depends on an old version of the openssl crate. The old openssl crate is not able to use at least openssl 1.1.1 (I don't know the exact version where it stops working)

thread 'main' panicked at 'Unable to detect OpenSSL version', /.../registry/src/github.com-1ecc6299db9ec823/openssl-0.9.24/build.rs:16:14
stack backtrace:
   0: std::sys::unix::backtrace::tracing::imp::unwind_backtrace
             at libstd/sys/unix/backtrace/tracing/gcc_s.rs:49
   1: std::sys_common::backtrace::print
             at libstd/sys_common/backtrace.rs:71
             at libstd/sys_common/backtrace.rs:59
   2: std::panicking::default_hook::{{closure}}
             at libstd/panicking.rs:211
   3: std::panicking::default_hook
             at libstd/panicking.rs:227
   4: std::panicking::rust_panic_with_hook
             at libstd/panicking.rs:476
   5: std::panicking::begin_panic
   6: build_script_build::main
   7: std::rt::lang_start::{{closure}}
   8: std::panicking::try::do_call
             at libstd/rt.rs:59
             at libstd/panicking.rs:310
   9: __rust_maybe_catch_panic
             at libpanic_unwind/lib.rs:102
  10: std::rt::lang_start_internal
             at libstd/panicking.rs:289
             at libstd/panic.rs:392
             at libstd/rt.rs:58
  11: main
  12: __libc_start_main
  13: _start