build: autotools files for libphosphor_dbus.so

Use the interface YAML files present to generate the server.cpp
and server.hpp files, build them into a shared library, and
install.

Change-Id: Ib08704c399975f42aa77f911a7bc7dc33bacba99
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
diff --git a/Makefile.am b/Makefile.am
new file mode 100644
index 0000000..7ac8318
--- /dev/null
+++ b/Makefile.am
@@ -0,0 +1,16 @@
+AM_DEFAULT_SOURCE_EXT = .cpp
+
+nobase_include_HEADERS = ## These get filled in by Makefile.interfaces
+
+libphosphor_dbusdir = ${libdir}
+libphosphor_dbus_LTLIBRARIES = libphosphor_dbus.la
+libphosphor_dbus_la_LDFLAGS = $(SYSTEMD_LIBS) -version-info 0:0:0 -shared
+libphosphor_dbus_la_CXXFLAGS = $(SYSTEMD_CFLAGS)
+
+BUILT_SOURCES = libphosphor_dbus.cpp
+CLEANFILES = libphosphor_dbus.cpp
+
+clean-local: clean-dbus
+
+-include Makefile.interfaces
+