Don't error out when building vendored LLVM when PATH is "odd"
Don't error out when building vendored LLVM when PATH is "odd"

I was building ponyc with a vendored LLVM in a WSL2 environment and
had it fail because `sh` couldn't make heads or tails of some of the
characters in my PATH entry. In particular, because of spaces in
some of the path names.

cquinn/ponyc,sgebbie/ponyc,jemc/ponyc,sgebbie/ponyc,dipinhora/ponyc,jemc/ponyc,ponylang/ponyc,sgebbie/ponyc,dipinhora/ponyc,cquinn/ponyc,cquinn/ponyc,sgebbie/ponyc,kulibali/ponyc,jemc/ponyc,ponylang/ponyc,kulibali/ponyc,cquinn/ponyc,kulibali/ponyc,ponylang/ponyc,kulibali/ponyc,sgebbie/ponyc,dipinhora/ponyc