build: meson support for rsyslog-config

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I5292ce1d09596f0d2e84c5d58490a9afe2b954db
diff --git a/meson.build b/meson.build
index 33d0348..6c968dc 100644
--- a/meson.build
+++ b/meson.build
@@ -111,6 +111,7 @@
 )
 
 subdir('phosphor-logging')
+subdir('phosphor-rsyslog-config')
 
 # Build libphosphor-logging.
 libphosphor_logging = library(