With this, a test that fails because vkd3d_unreacheable() was hit, will
now display the error line.
FAIL: tests/hlsl/some-test.shader_test
(SM4.0-SM5.1)OpenGL/SPIR-V 43[XF] 79[XF] 126[XF] 149[XF] 159[XF]
[AF] vkd3d/libs/vkd3d-shader/hlsl.c:246: Aborting, reached unreachable code.
[SIGABRT] Aborted (core dumped)
Some times the test can be aborted for reasons others than failed
assertions, such as segmentation faults or reaching unreacheable code.
This commit adds purple tags to the test driver for visual clarity.
We use "printf" instead of "print" in awk in order to avoid a newline in
the value of $xfcount, and use "-gt" instead of ">", which creates the
spurious file, in the comparison.
For the driver script to run properly it is necessary to run
"autoreconf" in the source directory and call the configure script again
in the build directory.
