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/ssltest.sh

@@ -1,5 +1,19 @@
 #!/bin/sh
 set -e
-PATH=../apps:$PATH
-export PATH
-$srcdir/testssl $srcdir/server.pem $srcdir/server.pem $srcdir/ca.pem
+
+ssltest_bin=./ssltest
+if [ -e ./ssltest.exe ]; then
+	ssltest_bin=./ssltest.exe
+fi
+
+openssl_bin=../apps/openssl
+if [ -e ../apps/openssl.exe ]; then
+	openssl_bin=../apps/openssl.exe
+fi
+
+if [ -z $srcdir ]; then
+	srcdir=.
+fi
+
+$srcdir/testssl $srcdir/server.pem $srcdir/server.pem $srcdir/ca.pem \
+	$ssltest_bin $openssl_bin