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.
diff --git a/misc/GNUmakefile b/misc/GNUmakefile
index fc75de5..241cd4a 100644
--- a/misc/GNUmakefile
+++ b/misc/GNUmakefile
@@ -82,7 +82,8 @@
--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
