remove regex anchor in lld linker detection to account for vendor, if
specified, being prepended to lld version string
Index: llvm-toolchain-12_12.0.1/llvm/cmake/modules/AddLLVM.cmake
===================================================================
--- llvm-toolchain-12_12.0.1.orig/llvm/cmake/modules/AddLLVM.cmake
+++ llvm-toolchain-12_12.0.1/llvm/cmake/modules/AddLLVM.cmake
@@ -196,7 +196,7 @@ if (NOT DEFINED LLVM_LINKER_DETECTED)
       set(LLVM_LINKER_DETECTED YES CACHE INTERNAL "")
       set(LLVM_LINKER_IS_GOLD YES CACHE INTERNAL "")
       message(STATUS "Linker detection: GNU Gold")
-    elseif("${stdout}" MATCHES "^LLD")
+    elseif("${stdout}" MATCHES "LLD")
       set(LLVM_LINKER_DETECTED YES CACHE INTERNAL "")
       set(LLVM_LINKER_IS_LLD YES CACHE INTERNAL "")
       message(STATUS "Linker detection: LLD")