move threads from backend to liblumiera

otherwise lib and common would depend on backend

src/lib/Makefile.am

@@ -28,6 +28,7 @@ liblumiera_la_SOURCES =						\
 	$(liblumiera_la_srcdir)/rwlock.c			\
 	$(liblumiera_la_srcdir)/condition.c			\
 	$(liblumiera_la_srcdir)/reccondition.c			\
+	$(liblumiera_la_srcdir)/threads.c			\
 	$(liblumiera_la_srcdir)/luid.c				\
 	$(liblumiera_la_srcdir)/safeclib.c			\
 	$(liblumiera_la_srcdir)/psplay.c			\
@@ -52,6 +53,7 @@ noinst_HEADERS +=						\
 	$(liblumiera_la_srcdir)/rwlock.h			\
 	$(liblumiera_la_srcdir)/condition.h			\
 	$(liblumiera_la_srcdir)/reccondition.h			\
+	$(liblumiera_la_srcdir)/threads.h			\
 	$(liblumiera_la_srcdir)/luid.h				\
 	$(liblumiera_la_srcdir)/safeclib.h			\
 	$(liblumiera_la_srcdir)/psplay.h			\

src/lib/thread-wrapper.hpp

@@ -29,7 +29,7 @@
 #include "lib/sync.hpp"
 
 extern "C" {
-#include "backend/threads.h"
+#include "lib/threads.h"
 }
 
 #include <tr1/functional>

src/lib/threads.c

@@ -23,7 +23,7 @@
 
 
 //TODO: Lumiera header includes//
-#include "backend/threads.h"
+#include "lib/threads.h"
 
 //TODO: internal/static forward declarations//