Replace autotools with meson

To introduce much simpler build configuration which is also easier to
maintain.

src/log.h

@@ -0,0 +1,30 @@
+/*
+ * tio - a simple TTY terminal I/O application
+ *
+ * Copyright (c) 2014-2017  Martin Lund
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+#ifndef LOG_H
+#define LOG_H
+
+void log_open(const char *filename);
+void log_write(char c);
+void log_close(void);
+void log_exit(void);
+
+#endif