[cmake] Remove the LLDB versions of the exception-controlling variables
[cmake] Remove the LLDB versions of the exception-controlling variables

Summary:
One can still use the LLVM variables to control this: LLVM_ENABLE_EH, LLVM_ENABLE_RTTI. It's not
clear to me why one would want to control these at lldb level and it's generally not even a good
idea to compile parts of the same binary with different values of these flags.

Reviewers: zturner, tfiala

Subscribers: lldb-commits

Differential Revision: http://reviews.llvm.org/D20673

git-svn-id: 4c4cc70b1ef44ba2b7963015e681894188cea27e@270863 91177308-0d34-0410-b5e6-96231b3b80d8

apple/swift-lldb,apple/swift-lldb,apple/swift-lldb,llvm-mirror/lldb,llvm-mirror/lldb,apple/swift-lldb,llvm-mirror/lldb,apple/swift-lldb,llvm-mirror/lldb,llvm-mirror/lldb,apple/swift-lldb