Clean up format in cmake file

Summary: Makes the indent consistent to other part of the file.

Subscribers: mgorny, lldb-commits

Tags: #lldb

Differential Revision: https://reviews.llvm.org/D68842

llvm-svn: 374483
GitOrigin-RevId: 7b9900dff3c09c562a9b0fdd5f6e8b4a7a2a96a8
1 file changed