AddLLVM: squelch CMP0007 by not adding empty elements to list

When configuring various llvm projects that use AddLLVM.cmake, this warning is
emitted many times, flooding the screen:

Policy CMP0007 is not set: list command no longer ignores empty elements.

The fix is removing an extra semicolon.

Differential Revision: http://reviews.llvm.org/D14339

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@252628 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed