Stupid Github CI make doesn't take environment variables into account.
We have to override them explicitly, hence the ridiculous CC="$CC".
make clean; make tis-ci
make clean; make test
-make clean; make test CFLAGS="$CFLAGS -DBLAKE2_NO_UNROLLING"
-make clean; make test CFLAGS="$CFLAGS -fsanitize=address"
-make clean; make test CFLAGS="$CFLAGS -fsanitize=memory"
-make clean; make test CFLAGS="$CFLAGS -fsanitize=undefined"
+make clean; make test CC="$CC" CFLAGS="$CFLAGS -DBLAKE2_NO_UNROLLING"
+make clean; make test CC="$CC" CFLAGS="$CFLAGS -fsanitize=address"
+make clean; make test CC="$CC" CFLAGS="$CFLAGS -fsanitize=memory"
+make clean; make test CC="$CC" CFLAGS="$CFLAGS -fsanitize=undefined"
make clean; make test.out CC="gcc -std=c99"; valgrind ./test.out
echo