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

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


git-svn-id: 756ef344af921d95d562d9e9f9389127a89a6314@278032 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/libcxx,llvm-mirror/libcxx,llvm-mirror/libcxx,llvm-mirror/libcxx,llvm-mirror/libcxx