no bootloader dependency in `Cargo.toml` error when compiling, but it is there

[90-008]

I'm getting this error while compiling bootloader:

error: no bootloader dependency in /home/patriot/Belgeler/projects/hakkero/Cargo.toml

  The `--kernel-manifest` path should point to the `Cargo.toml` of the kernel.
 --> /home/patriot/Belgeler/projects/hakkero/target/x86_64-unknown-uefi/release/build/bootloader-b9ead764961ec1c9/out/bootloader_config.rs:1:81
  |
1 | ... = compile_error ! ("no bootloader dependency in /home/patriot/Belgeler/projects/hakkero/Cargo.toml\n\n  The `--kernel-manifest` path should point to the `Cargo.toml` of the kernel.") ...
  |       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: aborting due to previous error

error: could not compile `bootloader`

it says I don't have a bootloader dependency in my Cargo.toml, but I do:

[target.'cfg(target_arch = "x86_64")'.dependencies]
bootloader = "0.10"

This is probably related to the handling in

bootloader/build.rs

Lines 243 to 246 in c09f94f

	if manifest
	.get("dependencies")
	.and_then(|d| d.get("bootloader"))
	.is_some()

. This should be changed to handle cases like that. Maybe we could use https://github.com/oli-obk/cargo_metadata instead? If we don't want to pull in a dependency, it should also be possible to recursively travel through dependencies.