- fix unix build

Author: pierrejoye

ext/gd/libgd/gd_interpolation.c

@@ -925,7 +925,7 @@ static inline LineContribType *_gdContributionsCalc(unsigned int line_size, unsi
     for (u = 0; u < line_size; u++) {
         const double dCenter = (double)u / scale_d;
         /* get the significant edge points affecting the pixel */
-        register int iLeft = max (0, (int)floor (dCenter - width_d));
+        register int iLeft = MAX(0, (int)floor (dCenter - width_d));
         int iRight = MIN((int)ceil(dCenter + width_d), (int)src_size - 1);
         double dTotalWeight = 0.0;
 		int iSrc;