[master] a65aa02 Enable optional lcov support

[Poul-Henning Kamp]

--------
In message <E1an2rV-00071t-KW at project.varnish-software.com>, Dridi Boukelmoune 
writes:

Uhm, this seems to only work with GNU-make  ?

>commit a65aa027fe3875374f95ec45cf32d166b3163e2b
>Author: Dridi Boukelmoune <dridi.boukelmoune at gmail.com>
>Date:   Fri Apr 1 09:11:17 2016 +0200
>
>    Enable optional lcov support
>    
>    With a minor tweak so that running `make lcov` is enough, rather than
>    the original `make check-code-coverage`:

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