meson: Fix glib, add gobject, gio, gthread, gmodule, etc

Several small fixes to the build files.

Lots of tests have also been added, and glib tests pass now.

gio/kqueue/meson.build

@@ -0,0 +1,15 @@
+kqueue_sources = [
+  'gkqueuefilemonitor.c',
+  'kqueue-helper.c',
+  'kqueue-thread.c',
+  'kqueue-sub.c',
+  'kqueue-missing.c',
+  'kqueue-utils.c',
+  'kqueue-exclusions.c',
+  'dep-list.c',
+]
+
+kqueue_lib = static_library('kqueue',
+  sources : kqueue_sources,
+  include_directories : inc_dirs,
+  c_args : [ '-DHAVE_CONFIG_H', '-fPIC', '-DG_DISABLE_DEPRECATED' ] + gio_c_args)