[nginx] Win32: preserving binary compatibility with Windows XP - Vista.

[Sergey Kandaurov]

details:   https://hg.nginx.org/nginx/rev/7da71a7b141a
branches:  
changeset: 7487:7da71a7b141a
user:      Sergey Kandaurov <pluknet at nginx.com>
date:      Thu Apr 04 16:26:56 2019 +0300
description:
Win32: preserving binary compatibility with Windows XP - Vista.

OpenSSL 1.1.0 and above uses BCrypt if available (Windows 7 or higher).
This results in an unusable binary on older Windows versions, when building
with newer Windows SDK (such as 7.0A).  Using CFLAGS to define _WIN32_WINNT
allows to set a desired ABI and make sure the binary works with Windows XP.

To not mix with other potential CFLAGS uses, it is set in GNUmakefile.

diffstat:

 misc/GNUmakefile |  3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diffs (13 lines):

diff -r 52d3600bc25e -r 7da71a7b141a misc/GNUmakefile
--- a/misc/GNUmakefile	Thu Apr 04 16:22:03 2019 +0300
+++ b/misc/GNUmakefile	Thu Apr 04 16:26:56 2019 +0300
@@ -82,7 +82,8 @@ win32:
 		--with-mail						\
 		--with-stream						\
 		--with-openssl=$(OBJS)/lib/$(OPENSSL)			\
-		--with-openssl-opt="no-asm no-tests"			\
+		--with-openssl-opt="no-asm no-tests			\
+			CFLAGS=-D_WIN32_WINNT=0x0501"			\
 		--with-http_ssl_module					\
 		--with-mail_ssl_module					\
 		--with-stream_ssl_module