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/pq_test.bat

@@ -0,0 +1,14 @@
+@echo off
+setlocal enabledelayedexpansion
+REM	pq_test.bat
+
+set TEST=Debug\pq_test.exe
+if not exist %TEST% exit /b 1
+
+set pq_output=pq_output.txt
+if exist %pq_output% del %pq_output%
+
+%TEST% > %pq_output%
+fc /b %pq_output% %srcdir%\pq_expected.txt
+
+endlocal