Enable tests on Visual Studio

- add patch for aeadtest.c to undef IN
- add patch for ocsp_test.c to call BIO_sock_init() before getaddrinfo()
- define STDERR_FILENO in unistd.h to build pkcs7test.c
- add option ENABLE_VSTEST(default OFF) to enable test on Visual Studio
- modify to pass test data file as an argument (aeadtest, evptest)
- add Windows scripts (ocsptest, pq_test, ssltest, testdsa, testenc, testrsa)
- do not build pidwraptest on MSVC
- fix some indentations

tests/ssltest.bat

@@ -0,0 +1,18 @@
+@echo off
+setlocal enabledelayedexpansion
+REM	ssltest.bat
+
+set ssltest_bin=Debug\ssltest.exe
+if not exist %ssltest_bin% exit /b 1
+
+set openssl_bin=..\apps\openssl\Debug\openssl.exe
+if not exist %openssl_bin% exit /b 1
+
+if "%srcdir%"=="" (
+	set srcdir=.
+)
+
+%srcdir%\testssl.bat %srcdir%\server.pem %srcdir%\server.pem %srcdir%\ca.pem ^
+    %ssltest_bin% %openssl_bin%
+
+endlocal