samples: update before release

Update all samples to reflect the new set of options, plus:
- remove the arm-iphone-linux-gnueabi sample (obsolete...)
- disable hard-float in ARM bare-metal samples.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>

 #!/bin/sh

 set -e

 printf "Running autoconf...\n"

 autoconf -Wall --force

 printf "Done. You may now run:\n    ./configure\n"