torsocks: Unsupported syscall errors in version 2.3.0

Copied from the downstream bug report:

After upgrading to torsocks-2.3.0, I get an error when using torify:

$ torify git clone https://github.com/freebsd/poudriere.git
1543787510 WARNING torsocks[25796]: [syscall] Unsupported syscall number 20. Denying the call (in tsocks_syscall() at syscall.c:568)
Cloning into 'poudriere'...
1543787510 WARNING torsocks[25796]: [syscall] Unsupported syscall number 2. Denying the call (in tsocks_syscall() at syscall.c:568)
error: cannot fork() for git-remote-https: Function not implemented

The same command works with torsocks 2.2.0.

syscall number 2 is fork. There have been some changes to syscall.c which may cause this issue.

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