Commit 7aa4de62 by Didik Setiawan

Fix DATADIR clash when build using MinGW64

* tests/Makefile.am: Change DATADIR to WGET_DATADIR
* unit-tests/Makefile.am: Likewise
* unit-tests/test.c: Likewise

When build Wget2 using MinGW64 and embedding other library
(Libmicrohttpd), DATADIR macro from Wget2 clash with MinGW64
header.
parent 07f6b81d
Pipeline #10829144 passed with stages
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