[llvm] Remove downstream workaround for LLVM Version

build_lightning.sh now reads from LLVMVersion.cmake, so we no longer need this workaround (that's a diff from upstream)

Author: lamb-j

llvm/CMakeLists.txt

@@ -19,21 +19,6 @@ endif()
 
 include(${LLVM_COMMON_CMAKE_UTILS}/Modules/LLVMVersion.cmake)
 
-# TODO: Remove the following block of llvm versions once build_lightning script
-# has been updated to lookup above LLVMVersion.cmake file instead of this file.
-if(NOT DEFINED LLVM_VERSION_MAJOR)
-  set(LLVM_VERSION_MAJOR 19)
-endif()
-if(NOT DEFINED LLVM_VERSION_MINOR)
-  set(LLVM_VERSION_MINOR 0)
-endif()
-if(NOT DEFINED LLVM_VERSION_PATCH)
-  set(LLVM_VERSION_PATCH 0)
-endif()
-if(NOT DEFINED LLVM_VERSION_SUFFIX)
-  set(LLVM_VERSION_SUFFIX git)
-endif()
-
 set_directory_properties(PROPERTIES LLVM_VERSION_MAJOR "${LLVM_VERSION_MAJOR}")
 
 if (NOT PACKAGE_VERSION)