update and mask unit tests when running on win32

Update pq_test to ignore changes in whitespace.
Update for new testssl params, specify absolute paths to test binaries.
Fork-based tests do not make sense on Windows.
Disable building biotest, since it is too specific to OpenBSD's behavior
to be useful on other platforms.

tests/pq_test.sh

@@ -1,3 +1,7 @@
 #!/bin/sh
 set -e
-./pq_test | cmp $srcdir/pq_expected.txt -
+TEST=./pq_test
+if [ -e ./pq_test.exe ]; then
+	TEST=./pq_test.exe
+fi
+$TEST | diff -b $srcdir/pq_expected.txt -