build: add cli11 dependency as necessary

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I5431ae89a8b14e0ddad6e23895efaa044d67df46
diff --git a/meson.build b/meson.build
index a75d25e..5337496 100644
--- a/meson.build
+++ b/meson.build
@@ -116,6 +116,7 @@
     'phosphor-gpio-monitor',
     'mainapp.cpp',
     dependencies: [
+        cli11_dep,
         libevdev,
         libsystemd,
         phosphor_logging,