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.
If a host project has -Wstrict-prototypes enabled, the mdbtools header
results in warnings. Turn on -Wstrict-prototypes for the whole project
so that these never occur again.
Some Access 2010 files use 0x03 as the version number rather than
0x0103. For this reason I have changed the call to mdb_get_int32 to
mdb_get_byte.
In addition, according to the Library of Congress page:
https://www.loc.gov/preservation/digital/formats/fdd/fdd000463.shtml
Access 2016 uses 0x05 as the version number. I have inferred from the
Wikipedia page that Access 2013 likely uses 0x04.
Evan Miller