CMakeLists.txt cleanups: synchronize version with rest of LLVM, consistent spacing.

Differential revision: https://reviews.llvm.org/D23091


git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@278032 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed