Use std::isfinite in C++ code

This is addition to parent revision fixing build failures.

sql/field.cc

@@ -2873,7 +2873,7 @@ int Field_decimal::store(double nr)
     return 1;
   }
   
-  if (!isfinite(nr)) // Handle infinity as special case
+  if (!std::isfinite(nr)) // Handle infinity as special case
   {
     overflow(nr < 0.0);
     return 1;

sql/item_func.h

@@ -237,7 +237,7 @@ class Item_func :public Item_func_or_sum
   */
   inline double check_float_overflow(double value)
   {
-    return isfinite(value) ? value : raise_float_overflow();
+    return std::isfinite(value) ? value : raise_float_overflow();
   }
   /**
     Throw an error if the input BIGINT value represented by the

sql/item_strfunc.cc

@@ -2641,7 +2641,7 @@ String *Item_func_format::val_str_ascii(String *str)
       return 0; /* purecov: inspected */
     nr= my_double_round(nr, (longlong) dec, FALSE, FALSE);
     str->set_real(nr, dec, &my_charset_numeric);
-    if (!isfinite(nr))
+    if (!std::isfinite(nr))
       return str;
     str_length=str->length();
   }

storage/innobase/gis/gis0geo.cc

@@ -355,7 +355,7 @@ mbr_join_square(
 
 	/* Check if finite (not infinity or NaN),
 	so we don't get NaN in calculations */
-	if (!isfinite(square)) {
+	if (!std::isfinite(square)) {
 		return DBL_MAX;
 	}
 

storage/innobase/gis/gis0rtree.cc

@@ -1952,7 +1952,7 @@ rtr_estimate_n_rows_in_range(
 
 	mtr.commit();
 
-	if (!isfinite(area)) {
+	if (!std::isfinite(area)) {
 		return(HA_POS_ERROR);
 	}