Fix the LLDB build under Debian Kfreebsd

Summary:
I don't know if there is a better way for the change in source/Host/freebsd/ThisThread.cpp


Reviewers: emaste

Subscribers: hansw, emaste, lldb-commits

Differential Revision: http://reviews.llvm.org/D7441

llvm-svn: 228710
diff --git a/lldb/source/Host/freebsd/ThisThread.cpp b/lldb/source/Host/freebsd/ThisThread.cpp
index fb25847..e524fd4 100644
--- a/lldb/source/Host/freebsd/ThisThread.cpp
+++ b/lldb/source/Host/freebsd/ThisThread.cpp
@@ -13,18 +13,27 @@
 #include "llvm/ADT/SmallVector.h"
 
 #include <pthread.h>
+#if defined (__FreeBSD__)
 #include <pthread_np.h>
+#endif
 
 using namespace lldb_private;
 
 void
 ThisThread::SetName(llvm::StringRef name)
 {
+#if defined (__FreeBSD__) // Kfreebsd does not have a simple alternative
     ::pthread_set_name_np(::pthread_self(), name.data());
+#endif
 }
 
 void
 ThisThread::GetName(llvm::SmallVectorImpl<char> &name)
 {
+#if defined (__FreeBSD__)
     HostNativeThread::GetName(::pthread_getthreadid_np(), name);
+#else
+// Kfreebsd
+    HostNativeThread::GetName((unsigned)pthread_self(), name);
+#endif
 }