use WIN32_LEAN_AND_MEAN to avoid symbol collisions

Author: QuietMisdreavus

src/include/cmark-gfm.h

@@ -807,7 +807,7 @@ const char *cmark_version_string(void);
  * John MacFarlane, Vicent Marti,  Kārlis Gaņģis, Nick Wellnhofer.
  */
 
-#if !defined(CMARK_NO_SHORT_NAMES) && !defined(_WIN32)
+#if !defined(CMARK_NO_SHORT_NAMES)
 #define NODE_DOCUMENT CMARK_NODE_DOCUMENT
 #define NODE_BLOCK_QUOTE CMARK_NODE_BLOCK_QUOTE
 #define NODE_LIST CMARK_NODE_LIST

src/include/mutex.h

@@ -30,7 +30,8 @@ pthread_mutex_lock(&NAME##_lock);
 
 #elif defined(_WIN32) // building for windows
 
-#define _WIN32_WINNT 0x0600
+#define _WIN32_WINNT 0x0600 // minimum target of Windows Vista
+#define WIN32_LEAN_AND_MEAN
 #include <windows.h>
 
 #define CMARK_DEFINE_ONCE(NAME) static INIT_ONCE NAME##_once = INIT_ONCE_STATIC_INIT;