[build] Use -no-pie on newer versions of gcc

[build] Use -no-pie on newer versions of gcc

Some distributions patch gcc to generate position independent
executables by default.  We currently include a workaround to check
for this and to add -fno-PIE -nopie to CFLAGS if required.

Newer patched versions of gcc require -fno-PIE -no-pie instead.  Check
for both variants.

Reported-by: Nathan Rennie-Waldock <nathan.renniewaldock@gmail.com>
Originally-fixed-by: Markos Chandras <mchandras@suse.de>
Signed-off-by: Michael Brown <mcb30@ipxe.org>