[json, test] Fix the json.td test - the path to python could contain spaces

Summary: The path to the python executable can contain spaces, so it should be specified with quotes.

Reviewers: asmith, simon_tatham

Reviewed By: simon_tatham

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D49258

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@337006 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed