pkg/csource: don't enable HandleSegv in short tests
pkg/csource: don't enable HandleSegv in short tests

HandleSegv can radically increase compilation time/memory consumption on large programs.
For example, for one program captured from this test enabling HandleSegv increases
compilation time from 1.94s to 104.73s and memory consumption from 136MB to 8116MB.
This leads to CI failures on #2688.
Don't enable HandleSegv in short tests.

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