build: move "shared/nm-{glib-aux,log-null,log-core}" to "src/libnm-{glib-aux,log-null,log-core}"

src/libnm-log-null/meson.build

@@ -0,0 +1,12 @@
+# SPDX-License-Identifier: LGPL-2.1-or-later
+
+libnm_log_null = static_library(
+  'nm-log-null',
+  sources: 'nm-logging-null.c',
+  include_directories: [
+    shared_inc,
+    src_inc,
+    top_inc,
+  ],
+  dependencies: glib_nm_default_dep,
+)

src/libnm-log-null/nm-logging-null.c

@@ -0,0 +1,36 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+/*
+ * Copyright (C) 2018 Red Hat, Inc.
+ */
+
+#include "libnm-glib-aux/nm-default-glib-i18n-lib.h"
+
+#include "libnm-glib-aux/nm-logging-fwd.h"
+
+/*****************************************************************************/
+
+gboolean
+_nm_log_enabled_impl(gboolean mt_require_locking, NMLogLevel level, NMLogDomain domain)
+{
+    return FALSE;
+}
+
+void
+_nm_log_impl(const char *file,
+             guint       line,
+             const char *func,
+             gboolean    mt_require_locking,
+             NMLogLevel  level,
+             NMLogDomain domain,
+             int         error,
+             const char *ifname,
+             const char *con_uuid,
+             const char *fmt,
+             ...)
+{}
+
+void
+_nm_utils_monotonic_timestamp_initialized(const struct timespec *tp,
+                                          gint64                 offset_sec,
+                                          gboolean               is_boottime)
+{}