Forks are not correctly detected

[Dr-Terrible]

When running cargo-ebuild for alacritty, the crate servo/rust-fontconfig is pulled instead of its fork (jwilm/rust-fontconfig) declared by Cargo.lock.

That causes the src_compile phase to die because cargo can't find the correct dependency.

[gibix]

rust-fontconfigconfig is pulled from with a specific git repo and font is pulled by alacritty with a relative path.
cargo-ebuild at now supports only crates from crates.io