Fix a couple of MSVC warnings.

* src/base/ftcalc.c (FT_MulAddFix): Add cast.
* src/sfnt/ttcolr.c (tt_face_get_colorline_stops, read_paint): Ditto.

src/base/ftcalc.c

@@ -1103,7 +1103,7 @@
     for ( i = 0; i < count; ++i )
       temp += (FT_Int64)s[i] * f[i];
 
-    return ( temp + 0x8000 ) >> 16;
+    return (FT_Int32)( ( temp + 0x8000 ) >> 16 );
 #else
     temp.hi = 0;
     temp.lo = 0;

src/sfnt/ttcolr.c

@@ -699,7 +699,7 @@
                                              item_deltas ) )
           return 0;
 
-        apaint->u.solid.color.alpha += item_deltas[0];
+        apaint->u.solid.color.alpha += (FT_F2Dot14)item_deltas[0];
       }
 #endif
 
@@ -1646,7 +1646,7 @@
           return 0;
 
         color_stop->stop_offset += F2DOT14_TO_FIXED( item_deltas[0] );
-        color_stop->color.alpha += item_deltas[1];
+        color_stop->color.alpha += (FT_F2Dot14)item_deltas[1];
       }
 #else
       FT_UNUSED( var_index_base );