fix warnings

Graphics/gl2ps.h

@@ -48,7 +48,9 @@
 #    pragma warning(disable:4127)
 #    pragma warning(disable:4996)
 #  endif
+#  if !defined(NOMINMAX)
 #    define NOMINMAX
+#  endif
 #  include <windows.h>
 #  undef NOMINMAX
 #  if defined(GL2PSDLL)

contrib/hxt/hxt_mesh.h

@@ -3,7 +3,7 @@
 
 #include "hxt_tools.h" // to have SIMD_ALIGN and stdint.h
 
-#if defined(WIN32)
+#if defined(WIN32) && !defined(INT32_MAX) // FIXME: Gmsh
 #define INT32_MAX        2147483647i32
 #endif