Attempt to unbreak CI (Android / libc 0.2.127).

[eddyb]

See #890 (comment) for previous discussion and additional details.

Fixes #890 (hopefully).

[eddyb]

Pushed another commit to clear the CARGO_ENCODED_RUSTFLAGS that cargo-apk sets, which was breaking this helper:

rust-gpu/examples/runners/wgpu/build.rs

Lines 29 to 34 in 0866cf5

	let status = std::process::Command::new("cargo")
	.args([
	"run",
	"--release",
	"-p",
	"example-runner-wgpu-builder",

[repi]

nice workaround :)