sdbus++-gen-meson: fix [more] meson dependencies

As a follow on to 5800d07910384ffad8409515bc510812e4f34334,
additional cases were noticed where the meson dependencies are
not correctly updated when multiple YAML files are used (such
as interfaces and events).

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Ie47bc156c2b3954d3c47c9d07a2e106d7cc87c63
diff --git a/example/gen/net/poettering/Calculator/meson.build b/example/gen/net/poettering/Calculator/meson.build
index 455afe9..1b4cc9b 100644
--- a/example/gen/net/poettering/Calculator/meson.build
+++ b/example/gen/net/poettering/Calculator/meson.build
@@ -1,7 +1,7 @@
 # Generated file; do not modify.
 generated_sources += custom_target(
     'net/poettering/Calculator__cpp'.underscorify(),
-    input: [ '../../../../yaml/net/poettering/Calculator.interface.yaml',  ],
+    input: [ '../../../../yaml/net/poettering/Calculator.events.yaml', '../../../../yaml/net/poettering/Calculator.interface.yaml',  ],
     output: [ 'event.cpp', 'event.hpp', 'common.hpp', 'server.cpp', 'server.hpp', 'aserver.hpp', 'client.hpp',  ],
     depend_files: sdbusplusplus_depfiles,
     command: [