fix: append test data dir definition instead of overriding previous compilation definitions #118 #705

Job	Run time
Cygwin with OMP (Release)	39m 53s
MacOS Ninja (Release)	5m 48s
Cygwin (Release)	40m 14s
ubuntu (Release)	9m 17s
MacOS-omp-homebrew Ninja (Release)	52s
ubuntu-gcc12 (Release)	12m 55s
MSys - mingw32 with OMP (Release)	22m 53s
MacOS-omp-macports Ninja (Release)	1m 30s
ubuntu (Debug)	7m 17s
Windows Ninja (Release)	12m 8s
MSys - mingw32 (Release)	22m 33s
MacOS Xcode (Release)	48s
ubuntu-gcc12 (Debug)	10m 39s
Windows NMake Makefiles (Release)	13m 44s
MSys - mingw64 with OMP (Release)	21m 26s
MacOS-omp-homebrew Xcode (Release)	46s
Windows Visual Studio 16 2019 (Release)	10m 22s
MSys - mingw64 (Release)	21m 18s
MacOS-omp-macports Xcode (Release)	1m 43s
Windows Ninja (Debug)	18m 41s
MSys - ucrt64 with OMP (Release)	21m 25s
MacOS Ninja (Debug)	6m 10s
MSys - ucrt64 (Release)	21m 14s
Windows NMake Makefiles (Debug)	22m 6s
MacOS-omp-homebrew Ninja (Debug)	51s
MSys - clang64 with OMP (Release)	8m 0s
Windows Visual Studio 16 2019 (Debug)	15m 40s
MacOS-omp-macports Ninja (Debug)	1m 39s
MSys - clang64 (Release)	7m 44s
MacOS Xcode (Debug)	47s
MSys - mingw64 with OMP (Debug)	23m 47s
MacOS-omp-homebrew Xcode (Debug)	50s
MSys - mingw64 (Debug)	24m 15s
MacOS-omp-macports Xcode (Debug)	1m 34s
MSys - ucrt64 with OMP (Debug)	25m 8s
MSys - ucrt64 (Debug)	25m 40s
MSys - clang64 with OMP (Debug)	6m 57s
MSys - clang64 (Debug)	6m 55s
	8h 15m 29s

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