Create libphosphor-logging library

The commit function would be too big to hold on the
header file. Move it to a library and update the
phosphos-logging.pc file for users to link against it.
Add dependency to libsdbusplus as the commit interface
would make use of the transaction id support.

Change-Id: I237b15e35a633f1da9bf3401b5bf754154f132db
Signed-off-by: Adriana Kobylak <anoo@us.ibm.com>
diff --git a/elog.cpp b/elog.cpp
new file mode 100644
index 0000000..2b452d4
--- /dev/null
+++ b/elog.cpp
@@ -0,0 +1,14 @@
+#include "elog.hpp"
+
+namespace phosphor
+{
+namespace logging
+{
+
+void commit()
+{
+}
+
+} // namespace logging
+} // namespace phosphor
+