fixed bug in Reals.Mod which was actual on x86_64

without prototype, return type of ecvt was int, which has 4 byte size on
x86 but still has the same size on x86_64, that's why pointer which is 8
byte long could not fit in the variable holding return value. And it
could get negative value causing programs to explode. Fixed with casting
the result to LONGINT.

src/lib/v4/armv6j/Reals.Mod

@@ -5,7 +5,7 @@ MODULE Reals;
 
 
   PROCEDURE -ecvt (x: LONGREAL; ndigit, decpt, sign: LONGINT): LONGINT
-      "ecvt (x, ndigit, decpt, sign)";
+      "(LONGINT)ecvt (x, ndigit, decpt, sign)";
 
   PROCEDURE Ten*(e: INTEGER): REAL;
     VAR r, power: LONGREAL;

src/lib/v4/armv6j_hardfp/Reals.Mod

@@ -5,7 +5,7 @@ MODULE Reals;
 
 
   PROCEDURE -ecvt (x: LONGREAL; ndigit, decpt, sign: LONGINT): LONGINT
-      "ecvt (x, ndigit, decpt, sign)";
+      "(LONGINT)ecvt (x, ndigit, decpt, sign)";
 
   PROCEDURE Ten*(e: INTEGER): REAL;
     VAR r, power: LONGREAL;

src/lib/v4/armv7a_hardfp/Reals.Mod

@@ -5,7 +5,7 @@ MODULE Reals;
 
 
   PROCEDURE -ecvt (x: LONGREAL; ndigit, decpt, sign: LONGINT): LONGINT
-      "ecvt (x, ndigit, decpt, sign)";
+      "(LONGINT)ecvt (x, ndigit, decpt, sign)";
 
   PROCEDURE Ten*(e: INTEGER): REAL;
     VAR r, power: LONGREAL;

src/lib/v4/powerpc/Reals.Mod

@@ -5,7 +5,7 @@ MODULE Reals;
 
 
   PROCEDURE -ecvt (x: LONGREAL; ndigit, decpt, sign: LONGINT): LONGINT
-      "ecvt (x, ndigit, decpt, sign)";
+      "(LONGINT)ecvt (x, ndigit, decpt, sign)";
 
   PROCEDURE Ten*(e: INTEGER): REAL;
     VAR r, power: LONGREAL;

src/lib/v4/x86/Reals.Mod

@@ -5,7 +5,7 @@ MODULE Reals;
 
 
   PROCEDURE -ecvt (x: LONGREAL; ndigit, decpt, sign: LONGINT): LONGINT
-      "ecvt (x, ndigit, decpt, sign)";
+      "(LONGINT)ecvt (x, ndigit, decpt, sign)";
 
   PROCEDURE Ten*(e: INTEGER): REAL;
     VAR r, power: LONGREAL;

src/lib/v4/x86_64/Reals.Mod

@@ -3,10 +3,9 @@ MODULE Reals;
 
   IMPORT S := SYSTEM;
 
-(*
   PROCEDURE -ecvt (x: LONGREAL; ndigit, decpt, sign: LONGINT): LONGINT
-      "ecvt (x, ndigit, decpt, sign)";
-*)
+      "(LONGINT)ecvt (x, ndigit, decpt, sign)";
+
   PROCEDURE Ten*(e: INTEGER): REAL;
     VAR r, power: LONGREAL;
   BEGIN r := 1.0;
@@ -65,7 +64,7 @@ MODULE Reals;
       d[k] := CHR(i MOD 10 + 48); i := i DIV 10; INC(k)
     END
   END Convert;
-
+(*
   PROCEDURE ConvertL*(x: LONGREAL; n: INTEGER; VAR d: ARRAY OF CHAR);
     VAR i, k: LONGINT;
   BEGIN
@@ -74,8 +73,7 @@ MODULE Reals;
       d[k] := CHR(i MOD 10 + 48); i := i DIV 10; INC(k)
     END
   END ConvertL;
- 
-(* (*commented because ecvt returns smth strange on x86_64, may be types must be checked, but anyway, getting rid of libc dependency is good *)
+ *)
   PROCEDURE ConvertL*(x: LONGREAL; n: INTEGER; VAR d: ARRAY OF CHAR);
     VAR decpt, sign, i: LONGINT; buf: LONGINT;
   BEGIN
@@ -86,7 +84,7 @@ MODULE Reals;
     i := n - i - 1;
     WHILE i >= 0 DO d[i] := "0"; DEC(i) END ;
   END ConvertL;
-*)
+
   PROCEDURE Unpack(VAR b, d: ARRAY OF S.BYTE);
     VAR i, k: SHORTINT; len: LONGINT;
   BEGIN i := 0; len := LEN(b);