[NFC] Invoke lipo from CMAKE_LIPO.
[NFC] Invoke lipo from CMAKE_LIPO.

This shouldn't change anything, except that a cmake cache file that specifies
CMAKE_LIPO can specify an alternate lipo to use.


git-svn-id: c199f293c43da69278bea8e88f92242bf3aa95f7@372790 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt