[HarfBuzz] [PATCH] Adding a configure flag to disable building of tests

[Tom Hacohen]

Dear all,

Currently, the testing code depends on g_test_fail which was only 
introduced in glib 2.30. This means that the harfbuzz build now depends 
on glib 2.30 was is not necessary for regular harfbuzz.

One solution, would be checking the existence of this function or 
checking that the glib version is new enough, and only then build the 
testing code. I opted for the more specific solution - letting people 
disable building the tests.

Many people don't care about the tests anyway, so allowing to disable 
them is probably a good idea anyway.

Currently, just to keep behaviour, I made test building on by default 
(tbh, I think it should be off by default) and people can disable them 
using --disable-tests.

Attached is a patch to implement the described behaviour.

--
Tom.
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