[Lsan] Disabling explicitally FreeBSD

As it is not implemented upon usage, it just provokes numerous linkage issues so better switch off clearly.

Reviewers: vitalybuka, morehouse

Reviewed By: morehouse

Differential Revision: https://reviews.llvm.org/D61484


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@359920 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed