native_types: Migrate large functions to shared lib

This speeds up compilation of changes and should save space in users of
the functions.

Change-Id: Iee9029800c11dcd4e94f165766836bae327ee9b5
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/meson.build b/meson.build
index b116c3c..790684e 100644
--- a/meson.build
+++ b/meson.build
@@ -16,6 +16,7 @@
 libsdbusplus_src = files(
     'src/exception.cpp',
     'src/bus.cpp',
+    'src/message/native_types.cpp',
     'src/sdbus.cpp',
     'src/server/interface.cpp',
     'src/server/transaction.cpp',