Allow to build without mmglib

src/meson.build

@@ -7,18 +7,23 @@
 
 subdir('libgdbofono')
 
-executable (
-    'eg25manager',
-    [
+src = [
         'at.c', 'at.h',
         'gpio.c', 'gpio.h',
         'manager.c', 'manager.h',
-        'mm-iface.c', 'mm-iface.h',
         'ofono-iface.c', 'ofono-iface.h',
         'suspend.c', 'suspend.h',
         'toml.c', 'toml.h',
         'udev.c', 'udev.h',
-    ],
+]
+
+if mmglib_dep.found()
+  src += ['mm-iface.c', 'mm-iface.h']
+endif
+
+executable (
+    'eg25manager',
+    src,
     dependencies : mgr_deps,
     link_with: gdbofono_lib,
     install : true