Mingwin Warning suppression.

[SVN r33403]

src/regex.cpp

@@ -28,7 +28,9 @@
 #endif
 #ifdef BOOST_REGEX_HAS_MS_STACK_GUARD
 #define WIN32_LEAN_AND_MEAN
-#define NOMINMAX
+#ifndef NOMINMAX
+#  define NOMINMAX
+#endif
 #define NOGDI
 #define NOUSER
 #include <windows.h>

src/static_mutex.cpp

@@ -24,7 +24,9 @@
 #include <boost/regex/pending/static_mutex.hpp>
 
 #if defined(BOOST_HAS_WINTHREADS)
-#define NOMINMAX
+#ifndef NOMINMAX
+#  define NOMINMAX
+#endif
 #define WIN32_LEAN_AND_MEAN
 #include <windows.h>
 #include <boost/static_assert.hpp>

src/w32_regex_traits.cpp

@@ -24,7 +24,9 @@
 #include <boost/regex/pattern_except.hpp>
 
 #define WIN32_LEAN_AND_MEAN
-#define NOMINMAX
+#ifndef NOMINMAX
+#  define NOMINMAX
+#endif
 #define NOGDI
 #include <windows.h>