Remove GLib dependency WIP

Add a shim implementing half-assed versions of most of the GLib
functions used by MDB Tools. If GLib is detected at compile-time,
use it, otherwise use the shim.

This work is not complete, as the option-parsing code is not yet
implemented - so most of the command-line tools crash.

include/mdbsql.h

@@ -25,7 +25,11 @@
 
 #include <stdio.h>
 #include <string.h>
+#ifdef HAVE_GLIB
 #include <glib.h>
+#else
+#include <mdbfakeglib.h>
+#endif
 #include <mdbtools.h>
 
 typedef struct {