Upgrade llvm toolchain version
llvm-3.7 toolchain no longer exists in 17.10.
By switching to llvm-4.0, this snap builds in both 16.04 and 17.10.
@@ -336,9 +336,9 @@ parts:
- cmake
- flex
- libedit-dev
- - libllvm3.7
- - llvm-3.7-dev
- - libclang-3.7-dev
+ - libllvm4.0
+ - llvm-4.0-dev
+ - libclang-4.0-dev
- python
- zlib1g-dev
- libelf-dev
