move libthread to libstb-hal

libthread/Makefile.am

@@ -0,0 +1,16 @@
+noinst_LTLIBRARIES = libthread.la
+
+AM_CPPFLAGS = -D__STDC_FORMAT_MACROS -D__STDC_CONSTANT_MACROS
+AM_CPPFLAGS += \
+	-I$(top_srcdir)/include
+
+AM_CXXFLAGS = -fno-rtti -fno-exceptions -fno-strict-aliasing
+
+AM_LDFLAGS = -lpthread -lrt
+
+libthread_la_SOURCES = \
+	condition_abstraction.cpp \
+	reentrant_mutex.cpp \
+	scoped_lock.cpp \
+	thread_abstraction.cpp \
+	mutex_abstraction.cpp