Fix typo: Make ifndef macroname the same as the define name

Signed-off-by: Sven Strickroth <email@cs-ware.de>

Author: csware

src/transports/winhttp.c

@@ -41,11 +41,11 @@
 #define WINHTTP_IGNORE_REQUEST_TOTAL_LENGTH 0
 #endif
 
-#ifndef WINHTTP_FLAG_SECURE_PROTOCOL_TLS_1_1
+#ifndef WINHTTP_FLAG_SECURE_PROTOCOL_TLS1_1
 # define WINHTTP_FLAG_SECURE_PROTOCOL_TLS1_1 0x00000200
 #endif
 
-#ifndef WINHTTP_FLAG_SECURE_PROTOCOL_TLS_1_2
+#ifndef WINHTTP_FLAG_SECURE_PROTOCOL_TLS1_2
 # define WINHTTP_FLAG_SECURE_PROTOCOL_TLS1_2 0x00000800
 #endif