rust: remove patch to change path to $S/mk/cfg

Since we no longer use shared source we can modify the source directory
as we build. This drops another patch we need to build and simplifies
the addition of Rust 1.12.1 in #97.

recipes-devtools/rust/rust_1.10.0.bb

@@ -11,7 +11,6 @@ SRC_URI += " \
         file://rust-${PV}/0007-mk-install-use-disable-rewrite-paths.patch \
         file://rust-${PV}/0008-Allow-overriding-crate_hash-with-C-crate_hash.patch \
         file://rust-${PV}/0009-mk-platform.mk-pass-C-crate_hash-to-builds.patch \
-        file://rust-${PV}/0010-mk-allow-changing-the-platform-configuration-source-.patch \
         file://rust-${PV}/0011-Get-rid-of-the-.note-interpretation-of-rustc-dylib-m.patch \
         file://rust-installer-${PV}/0001-add-option-to-disable-rewriting-of-install-paths.patch;patchdir=src/rust-installer \
         "