rust: bump versions to 1.12.1

Redid how compiler-rt is built by using the Rust makefiles to build it
instead of compiler-rt's build system. Rust itself deviated from using
compiler-rt's build system and provided their own rules requiring the
source tree to be configured to use them.

recipes-devtools/rust/rust_1.12.1.bb

@@ -0,0 +1,28 @@
+inherit rust-installer
+require rust.inc
+require rust-source-${PV}.inc
+
+# the configure script always requires cmake so despite
+# rust not needing this (only rust-llvm needs it) we must
+# have it for the configure script to succeed.
+DEPENDS += "cmake-native"
+
+SRC_URI += " \
+        file://rust-${PV}/0001-Target-add-default-target.json-path-libdir-rust-targ.patch \
+        file://rust-${PV}/0002-mk-for-stage0-use-RUSTFLAGS-to-override-target-libs-.patch \
+        file://rust-${PV}/0003-mk-add-missing-CFG_LIBDIR_RELATIVE.patch \
+        file://rust-${PV}/0005-std-thread_local-workaround-for-NULL-__dso_handle.patch \
+        file://rust-${PV}/0006-mk-install-use-disable-rewrite-paths.patch \
+        file://rust-${PV}/0007-Allow-overriding-crate_hash-with-C-crate_hash.patch \
+        file://rust-${PV}/0008-mk-platform.mk-pass-C-crate_hash-to-builds.patch \
+        file://rust-installer-${PV}/0001-add-option-to-disable-rewriting-of-install-paths.patch;patchdir=src/rust-installer \
+        "
+
+DEPENDS += "rust-llvm (=${PV})"
+
+# Otherwise we'll depend on what we provide
+INHIBIT_DEFAULT_RUST_DEPS_class-native = "1"
+# We don't need to depend on gcc-native because yocto assumes it exists
+PROVIDES_class-native = "virtual/${TARGET_PREFIX}rust"
+
+BBCLASSEXTEND = "native"