build: meson support for libphosphor-logging

Create just enough meson directives to create the equivalent
of libphosphor-logging, so that this repository can be picked
up as a meson subproject.  Remainder of the conversion to meson
will be in follow-on commits.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Ifbcc58b118352d8f0338221c4cb7e472c2be7a43
diff --git a/subprojects/phosphor-dbus-interfaces.wrap b/subprojects/phosphor-dbus-interfaces.wrap
new file mode 100644
index 0000000..935a8b2
--- /dev/null
+++ b/subprojects/phosphor-dbus-interfaces.wrap
@@ -0,0 +1,3 @@
+[wrap-git]
+url = https://github.com/openbmc/phosphor-dbus-interfaces.git
+revision = HEAD