rust-crate.eclass does not apply PATCHES

[kentfredric]

Fortunately, the src_prepare is not exported by default, so as long as you don't define src_prepare yourself, or, if you do, implement it as:

src_prepare() {
   # stuff here
   default
}

then PATCHES get applied.

However, if you implement it as:

src_prepare() {
   # stuff here
   rust-crate_src_prepare
}

PATCHES don't get applied.