ts_calibrate_sdl.c: Use all needed functions from testutils
ts_calibrate_sdl.c: Use all needed functions from testutils

It should work, but refactoring and avoiding code duplication is
still to be done.

Signed-off-by: Martin Kepplinger <5f224f582e4d41e2bdb8535d23e6b63d7ab1203d@ginzinger.com>

kergoth/tslib,kergoth/tslib,kergoth/tslib,kergoth/tslib