clang/test/Index/getcursor-preamble.m: Tweak for win32. env(1) is required to change variables locally.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@173843 91177308-0d34-0410-b5e6-96231b3b80d8
clang/test/Index/getcursor-preamble.m: Formatting.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@173844 91177308-0d34-0410-b5e6-96231b3b80d8