Update the source paths for each item

The path to the rust source changes from 1.15 so preemptively make
changes to prepare for that.

Signed-off-by: Derek Straka <derek@asterius.io>
Signed-off-by: Doug Goldstein <cardoe@cardoe.com>
(cherry picked from commit 64cdd4b714)

recipes-devtools/rust/rust.inc

@@ -10,8 +10,6 @@ SRC_URI = "\
 	https://static.rust-lang.org/dist/${RUST_SNAPSHOT}.tar.gz;name=rust-snapshot \
     "
 
-S = "${WORKDIR}/rustc-${PV}"
-
 DEPENDS += "file-native"
 
 # We generate local targets, and need to be able to locate them