__dso_handle error when using 3rd-party Rust crate in host

[rtfeldman]

In e052938 I tried actually using a 3rd-party Rust crate (reqwest - possibly relevantly, alongside openssl = { version = "0.10", features = ["vendored"] } to have openssl be built statically during Rust build time; when I swiwtched from reqwest and openssl to the pure-Rust ureq crate this stopped happening). Previously, I'd had reqwest and openssl as dependencies, but was not actually calling anything from them. (I also tried reqwest without openssl but then the crate failed to install because it said it couldn't find libssl on my system.)

As soon as I added the call and ran cargo run run examples/cli/HttpGet.roc, the host started failing to link, with this error:

ld: /home/rtfeldman/code/roc/examples/cli/platform/host.o:(.data._rust_extern_with_linkage___dso_handle+0x0): undefined reference to `__dso_handle'
ld: /usr/lib/x86_64-linux-gnu/libc_nonshared.a(atexit.oS): in function `atexit':
(.text+0x7): undefined reference to `__dso_handle'
ld: /usr/lib/x86_64-linux-gnu/libc_nonshared.a(pthread_atfork.oS): in function `__pthread_atfork':
(.text+0x7): undefined reference to `__dso_handle'
ld: /home/rtfeldman/code/roc/examples/cli/http-get: hidden symbol `__dso_handle' isn't defined
ld: final link failed: bad value

An old Rust issue (which is actually just someone's question) seems relevant here since I am building on a Linux system that has g++ installed, although I'm not sure how to resolve the error!