Fix flaky strtok.c test.
Fix flaky strtok.c test.

Asserting the result of strtok when we expect delimiter overflow is
flaky, the result depends on the random state of memory right after the
delimiters.

git-svn-id: c199f293c43da69278bea8e88f92242bf3aa95f7@298743 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt