[PATCH] Avoid use of bash-specific /dev/fd/...

[Ed Maste]

On FreeBSD we may not have fdescfs(5) mounted, in which case bash's cmd <(foo) syntax won't work.

In my local test ninja check-profile reports:

```
diff: /dev/fd/63: No such file or directory
diff: /dev/fd/62: No such file or directory
diff: /dev/fd/63: No such file or directory
diff: /dev/fd/62: No such file or directory
```

Modify this script to use temp files for diff instead, and then switch to /bin/sh.

http://reviews.llvm.org/D5631

Files:
  lib/dfsan/scripts/check_custom_wrappers.sh
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