unittests/CMakeLists.txt: [PR8225] Tweak linking JITTests on MSVC to add JITTests.def.

CMake can pass *.def to link.exe.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119783 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed