less _WIN64 warnings

Author: Nat!

src/mulle-objc-signature.c

@@ -737,7 +737,7 @@ char   *_mulle_objc_signature_supply_typeinfo( char *types,
                                                                    supplier->index == 2
                                                                    ? alignof( long double)
                                                                    : info->bits_struct_alignment / 8);
-      supplier->invocation_offset = info->invocation_offset + info->natural_size;
+      supplier->invocation_offset = (int32_t) (info->invocation_offset + info->natural_size);
    }
    else
       supplier->invocation_offset = -1;  // invalidate
@@ -897,7 +897,7 @@ char   *mulle_objc_signature_supply_size_and_alignment( char *types,
 
    next = _mulle_objc_signature_supply_typeinfo( types, NULL, &info);
    if( size)
-      *size = info.bits_size >> 3;
+      *size = (unsigned int) (info.bits_size >> 3);
    if( alignment)
       *alignment = info.natural_alignment;
 
@@ -1209,8 +1209,8 @@ int   _mulle_objc_typeinfo_is_compatible( struct mulle_objc_typeinfo *a,
    size_t   a_len;
    size_t   b_len;
 
-   a_len = a->pure_type_end - a->type;
-   b_len = b->pure_type_end - b->type;
+   a_len = (size_t) (a->pure_type_end - a->type);
+   b_len = (size_t) (b->pure_type_end - b->type);
 
    return( types_are_compatible( a->type, a_len, b->type, b_len));
 }

src/mulle-objc-symbolizer.c

@@ -223,7 +223,7 @@ struct mmc *
    mulle_objc_implementation_t   imp;
    mulle_objc_implementation_t   nextimp;
 
-   n      = array->_count;
+   n      = (int) array->_count;
    first  = 0;
    last   = (int) (n - 1);
    middle = (first + last) / 2;