Build gdbm database from original text file.

src/Airports/buildsimple.cxx

@@ -0,0 +1,15 @@
+// dump out a gdbm version of the simple airport file
+
+#include "simple.hxx"
+
+int main( int argc, char **argv ) {
+    FGAirportsUtil airports;
+    FGAirport a;
+
+    if ( argc == 3 ) {
+	airports.load( argv[1] );
+	airports.dump_gdbm( argv[2] );    
+    } else {
+	cout << "usage: " << argv[0] << " <in> <out>" << endl;
+    }
+}