rust-llvm: stop using shared source

Convert rust-llvm to not use the shared source setup and instead use its
own extracted directory. Include the version info in the bitbake file so
that in the future we can support multiple versions via a
PREFERRED_VERSIONS variable.

recipes-devtools/rust/rust-llvm.inc

@@ -1,9 +1,14 @@
-require rust-shared-source.inc
-
 SUMMARY = "LLVM compiler framework (packaged with rust)"
 LICENSE = "NCSA"
 
-S .= "/src/llvm"
+SRC_URI = "\
+	https://static.rust-lang.org/dist/rustc-${PV}-src.tar.gz;name=rust \
+	file://rust-llvm/0001-Don-t-build-unittests.patch \
+"
+
+S = "${WORKDIR}/rustc-${PV}/src/llvm"
+
+LIC_FILES_CHKSUM = "file://LICENSE.TXT;md5=4c0bc17c954e99fd547528d938832bfa"
 
 inherit autotools