[compiler-rt] Fixing Linux compile error due to use of clone

[Andy Jost]

First post to llvm-commits, so I may not know the process.  I'm hoping someone will review and submit this for me.

The attached patch fixes an unsafe use of clone in projects/compiler-rt/lib/sanitizer_common/sanitizer_stoptheworld_linux_libcdep.cc.

>From the clone man page:
In Linux 2.4 and earlier, clone() does not take arguments ptid, tls, and ctid.

Those last three arguments are unused in this case, anyway, so I just removed them.  This fixes the build of compiler-rt on my machine.

Is a testcase needed?  If so, where should I look to get started?

-Andy
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