tools/syz-prog2c: allow to specify target OS
tools/syz-prog2c: allow to specify target OS

xairy/syzkaller,xairy/syzkaller,xairy/syzkaller,xairy/syzkaller,google/syzkaller,google/syzkaller,google/syzkaller,google/syzkaller,zoulasc/syzkaller,zoulasc/syzkaller,zoulasc/syzkaller,google/syzkaller,google/syzkaller,xairy/syzkaller,google/syzkaller,xairy/syzkaller,zoulasc/syzkaller,xairy/syzkaller