gpsd: fix build issues

The first patch gpsd-01-sconstruct-python-2.5-compat.patch is aimed at
fixing Python 2.5 compatibility issues such as:

 http://autobuild.buildroot.org/results/844a7f8698567688eba094f64dd2bf5157efd994/build-end.log

The second patch gpsd-02-sconstruct-ncurses-config-path.patch
implements a proper mechanism to specify the path to
ncurse5-config. It obsoletes the previous
gpsd-fix-acs_map-compile-errors patch, and solves build problems such
as:

 http://autobuild.buildroot.org/results/92ae3d53e8aa68d8b1a2eccad68c98f577cb6437/build-end.log



Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Acked-by: Simon Dawson <spdawson@gmail.com>