Obliterate LLDB_CONFIGURATION_BUILDANDINTEGRATION

Summary:
With the XCode project gone, there doesn't seem to be anything setting
this macro anymore -- and the macro wasn't doing much anyway.

Reviewers: jingham, sgraenitz

Subscribers: emaste, lldb-commits

Differential Revision: https://reviews.llvm.org/D66742

llvm-svn: 371018