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

patches/aeadtest.c.patch

@@ -0,0 +1,15 @@
+--- tests/aeadtest.c.orig	2016-10-18 17:03:33.845870889 +0900
++++ tests/aeadtest.c	2016-10-18 17:11:19.880841283 +0900
+@@ -75,6 +75,12 @@
+ 
+ #define BUF_MAX 1024
+ 
++#ifdef _MSC_VER
++#ifdef IN
++#undef IN
++#endif
++#endif
++
+ /* These are the different types of line that are found in the input file. */
+ enum {
+ 	AEAD = 0,	/* name of the AEAD algorithm. */

patches/ocsp_test.c.patch

@@ -0,0 +1,14 @@
+--- tests/ocsp_test.c.orig	2016-10-18 18:12:39.854607509 +0900
++++ tests/ocsp_test.c	2016-10-18 18:14:29.261600559 +0900
+@@ -16,6 +16,11 @@
+ 	hints.ai_family = AF_INET;
+ 	hints.ai_socktype = SOCK_STREAM;
+ 
++#ifdef _MSC_VER
++	if (BIO_sock_init() != 1)
++		exit(-1);
++#endif
++
+ 	error = getaddrinfo(host, port, &hints, &res);
+ 	if (error != 0) {
+ 		perror("getaddrinfo()");