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/testdsa.bat

@@ -0,0 +1,38 @@
+@echo off
+setlocal enabledelayedexpansion
+REM	testdsa.bat
+
+
+REM # Test DSA certificate generation of openssl
+
+set cmd=..\apps\openssl\Debug\openssl.exe
+if not exist %cmd% exit /b 1
+
+if "%srcdir%"=="" (
+	set srcdir=.
+)
+
+REM # Generate DSA paramter set
+%cmd% dsaparam 512 -out dsa512.pem
+if !errorlevel! neq 0 (
+	exit /b 1
+)
+
+
+REM # Generate a DSA certificate
+%cmd% req -config %srcdir%\openssl.cnf -x509 -newkey dsa:dsa512.pem -out testdsa.pem -keyout testdsa.key
+if !errorlevel! neq 0 (
+	exit /b 1
+)
+
+
+REM # Now check the certificate
+%cmd% x509 -text -in testdsa.pem
+if !errorlevel! neq 0 (
+	exit /b 1
+)
+
+del testdsa.key dsa512.pem testdsa.pem
+
+exit /b 0
+endlocal