m4: Remove pthread from tests

configure: hardening logic is backwards Before this change, the argument parsing was busted. The --help string only compounded the incorrect behavior by suggesting that --disable-hardening could take a yes/no argument. | before | after ------------------------------+----------+-------- <no option> | enable | enable --enable-hardening | disable | enable --enable-hardening=yes | disable | enable --enable-hardening=no | enable | disable --disable-hardening | enable | disable --disable-hardening=yes | error | error --disable-hardening=no | error | error

configure: Check for hardening flags