CodeCoverage: Skip headersclean test.
CodeCoverage: Skip headersclean test.

The code coverage tool adds #line when instrumenting the code using the gcc
syntax.

tst_headersclean uses the -pedantic-errors flag which causes a fatal error
when the code is instrumented with the coverage tool.

Similar change was done for qtbase (4ee14d6f87688492).

Change-Id: I525879ef56463473dd3c9eb91dee4d9b8310cdf9
Reviewed-by: Rohan McGovern <d75463945f40a9669160a73cef2843e56b22c602@nokia.com>

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