Try to fix WindowsManifest CMake logic on Windows
authorReid Kleckner <rnk@google.com>
Sat, 29 Feb 2020 01:21:50 +0000 (17:21 -0800)
committerReid Kleckner <rnk@google.com>
Sat, 29 Feb 2020 01:24:03 +0000 (17:24 -0800)
commite441a584f3f7d743ab77031a47d9ad60ee56b53d
treeb259375bc36e7e2b33251dfc25f65939bde66277
parentd334ce0b5acb945d6202d0ab6a17bdca530f50c1
Try to fix WindowsManifest CMake logic on Windows

CMake is complaining about the "^" regex if the prefixes are empty
strings.
llvm/lib/WindowsManifest/CMakeLists.txt