Fixed an issue where the LDFLAGS were not correctly gettting modified to be additive.



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@176281 91177308-0d34-0410-b5e6-96231b3b80d8
Fix the getCompilerVersion() function to do the right thing with clang 5.0 which now says "LLVM version" instead of "clang version".



git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@176282 91177308-0d34-0410-b5e6-96231b3b80d8