Fix a compilation issue

Author: zhi-wang

src/acc/hippo/cflux.cpp

@@ -65,7 +65,7 @@ static void angchg_acc1()
       if (rab != 0 and rcb != 0) {
          dot = xab * xcb + yab * ycb + zab * zcb;
          cosine = dot / (rab * rcb);
-         cosine = REAL_MIN(1.0, REAL_MAX(-1, cosine));
+         cosine = REAL_MIN((real)1, REAL_MAX((real)-1, cosine));
          angle = radian * REAL_ACOS(cosine);
 
          int ab = balist[i][0];

src/cu/hippo/cflux.cu

@@ -62,7 +62,7 @@ static void bndangChg_cu1(real* restrict pdelta,
          real dot, angle, cosine;
          dot = xab * xcb + yab * ycb + zab * zcb;
          cosine = dot / (rab * rcb);
-         cosine = REAL_MIN(1.0, REAL_MAX(-1, cosine));
+         cosine = REAL_MIN((real)1, REAL_MAX((real)-1, cosine));
          angle = radian * REAL_ACOS(cosine);
 
          int ab = balist[i][0];