Bug#662969: yabause: Hardening flags not enabled

[Guillaume Duhamel]

Heya,

I've commited a slighty modified version of the patch in the upstream
repository:
http://yabause.svn.sourceforge.net/viewvc/yabause?view=revision&revision=2890

This include the changes to the CMakeLists.txt to not "hide" CFLAGS, but
doesn't include the change to the autopackage script as it's not used
in the build
process (and autopackage is a dead project anyways...).