clang: fix upstream version check

(From OE-Core rev: 0dfdaca8405f4f1a9c188f736a99c39b7f8272b3)

Signed-off-by: Alexander Kanavin <alex@linutronix.de>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/clang/common.inc

@@ -14,6 +14,8 @@ LICENSE = "Apache-2.0-with-LLVM-exception"
 # GA Release
 RELEASE ?= "${PV}"
 BASEURI ?= "${LLVM_HTTP}/llvm-project/releases/download/llvmorg-${PV}/llvm-project-${PV}.src.tar.xz"
+UPSTREAM_CHECK_URI = "${LLVM_HTTP}/llvm-project/releases/"
+UPSTREAM_CHECK_REGEX = "releases/tag/llvmorg-?(?P<pver>\d+(\.\d+)+)"
 SOURCEDIR ?= "llvm-project-${PV}.src"
 SRC_URI[sha256sum] = "b6183c41281ee3f23da7fda790c6d4f5877aed103d1e759763b1008bdd0e2c50"