[WT-3845] Compiler warning in examples using GCC 5.4.0 - MongoDB Jira

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I'm seeing a compiler warning that results in a compilation error when using --enable-strict:

../../../examples/c/ex_smoke.c: In function ‘main’:

../../../examples/c/ex_smoke.c:48:2: error: ignoring return value of ‘system’, declared with attribute warn_unused_result [-Werror=unused-result]

  (void)system("rm -rf WT_HOME && mkdir WT_HOME");

  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

cc1: all warnings being treated as errors

We should handle an error elegantly.