Remove unused crate patches

[mkrasnitski]

These patches are not used and cargo gives the following warning when compiling:

warning: Patch `alpm v3.0.4 (https://github.com/archlinux/alpm.rs?rev=306342#306342ef)` was not used in the crate graph.
Patch `aur-depends v3.0.0 (https://github.com/Morganamilo/aur-depends?rev=30c2c1#30c2c150)` was not used in the crate graph.
Check that the patched package version and available features are compatible
with the dependency requirements. If the patch has a different version from
what is locked in the Cargo.lock file, run `cargo update` to use the new
version. This may also occur with an optional dependency that is not enabled.

[Morganamilo]

Just remove the two causing the warning. I frequently use the others to test cross library changes so I keep them around.