Add min() macro definition

It's not defined in MSVC and not supported by C standards

src/tools/spice2xyzv/spice2xyzv.cpp

@@ -19,6 +19,10 @@
 #include <cmath>
 #include <ctime>
 
+#ifndef min
+#define min(a, b) ((a) < (b) ? (a) : (b))
+#endif
+
 using namespace std;