Track new configure flags introduced for version 11 in pg_config.h.win32

The following set of flags mainly matter when building Postgres code
with MSVC and those have been forgotten with latest developments:
- HAVE_LDAP_INITIALIZE, added by 35c0754f, and marked as disabled.
ldap_initialize() is a non-standard extension that provides a way to use
"ldaps" with OpenLDAP, but it is not supported on Windows, and instead
the non-standard ldap_sslinit() is used if WIN32 is defined.  Per input
from Thomas Munro.
- HAVE_X509_GET_SIGNATURE_NID, added by 054e8c6c, which is used by
SCRAM's channel binding tls-server-end-point.  Having this flag disabled
would cause this channel binding type to be unsupported for Windows
builds.
- HAVE_SSL_CLEAR_OPTIONS, added recently as of a364dfa4 to disable SSL
compression.
- HAVE_ASN1_STRING_GET0_DATA, added by 5c6df67, which is used to track
a new compatibility with OpenSSL 1.1.0.  This was missing from
pg_config.win32.h and is not enabled by default.  HAVE_BIO_GET_DATA,
HAVE_OPENSSL_INIT_SSL and HAVE_BIO_METH_NEW gain the same treatment.

The second and third flags are enabled with this commit, which raises
the bar of OpenSSL support to 1.0.2 on Windows as a minimum.  As this
is the LTS (long-time support) version of OpenSSL community and knowing
that all recent installers referred by OpenSSL upstream don't have
anymore 1.0.1 or older, we could live with that requirement.  In order
to allow the code to compile with OpenSSL 1.1.0, all the flags mentioned
above need to be enabled in pg_config.h.win32.

Author: Michael Paquier
Reviewed-by: Andrew Dunstan
Discussion: https://postgr.es/m/20180529211559.GF6632@paquier.xyz

src/include/pg_config.h.win32

@@ -72,6 +72,15 @@
 # define gettimeofday(a,b) gettimeofday(a)
 #endif
 
+/* Define to 1 if you have the `ASN1_STRING_get0_data' function. */
+/* #undef HAVE_ASN1_STRING_GET0_DATA */
+
+/* Define to 1 if you have the `BIO_get_data' function. */
+/* #undef HAVE_BIO_GET_DATA */
+
+/* Define to 1 if you have the `BIO_meth_new' function. */
+/* #undef HAVE_BIO_METH_NEW */
+
 /* Define to 1 if you have the `cbrt' function. */
 //#define HAVE_CBRT 1
 
@@ -233,6 +242,9 @@
 /* Define to 1 if you have the <ldap.h> header file. */
 /* #undef HAVE_LDAP_H */
 
+/* Define to 1 if you have the `ldap_initialize' function. */
+/* #undef HAVE_LDAP_INITIALIZE */
+
 /* Define to 1 if you have the `crypto' library (-lcrypto). */
 /* #undef HAVE_LIBCRYPTO */
 
@@ -288,6 +300,9 @@
 /* Define to 1 if you have the <netinet/tcp.h> header file. */
 /* #undef HAVE_NETINET_TCP_H */
 
+/* Define to 1 if you have the `OPENSSL_init_ssl' function. */
+/* #undef HAVE_OPENSSL_INIT_SSL */
+
 /* Define to 1 if you have the <pam/pam_appl.h> header file. */
 /* #undef HAVE_PAM_PAM_APPL_H */
 
@@ -361,6 +376,9 @@
 /* Define to 1 if you have the `srandom' function. */
 /* #undef HAVE_SRANDOM */
 
+/* Define to 1 if you have the `SSL_clear_options' function. */
+#define HAVE_SSL_CLEAR_OPTIONS 1
+
 /* Define to 1 if you have the `SSL_get_current_compression' function. */
 #define HAVE_SSL_GET_CURRENT_COMPRESSION 1
 
@@ -543,6 +561,9 @@
 /* Define to 1 if you have the <winldap.h> header file. */
 /* #undef HAVE_WINLDAP_H */
 
+/* Define to 1 if you have the `X509_get_signature_nid' function. */
+#define HAVE_X509_GET_SIGNATURE_NID 1
+
 /* Define to 1 if the system has the type `_Bool'. */
 /* #undef HAVE__BOOL */