[master] Set version 1.0.0 for libkea-threads.

Agreed on jabber.

src/lib/util/threads/Makefile.am

@@ -9,4 +9,7 @@ libkea_threads_la_SOURCES  = sync.h sync.cc
 libkea_threads_la_SOURCES += thread.h thread.cc
 libkea_threads_la_LIBADD  = $(top_builddir)/src/lib/exceptions/libkea-exceptions.la
 
+libkea_threads_la_LDFLAGS  = -no-undefined -version-info 1:0:0
+
+
 CLEANFILES = *.gcno *.gcda