[AC21.5] Cleaning out old work #1: double-cast to fix C++ build

APPROVE COMMIT 21.5

This is a now-ancient patch from Jerry.  I haven't actually run with
it but I've verified that the build fails without the patch and
succeeds with it, so I'm pushing.

I wonder if maybe "long" shouldn't be "EMACS_INT"?  In theory
EMACS_INT could be long long on some platform to accomodate void*,
IIRC.

diff -U0 -r acf690294825 -r 28813695b141 lwlib/ChangeLog
--- a/lwlib/ChangeLog	Wed Oct 28 09:17:22 2015 +0100
+++ b/lwlib/ChangeLog	Mon Jan 04 12:14:20 2016 +0900
@@ -0,0 +1,5 @@
+2015-01-07  Jerry James  <[email protected]>
+ 
+	* lwlib-Xaw.c (xaw_scrollbar_scroll): Add typecast to fix g++ build,
+	problem reported by Marcus Harnisch.
+
diff -r acf690294825 -r 28813695b141 lwlib/lwlib-Xaw.c
--- a/lwlib/lwlib-Xaw.c	Wed Oct 28 09:17:22 2015 +0100
+++ b/lwlib/lwlib-Xaw.c	Mon Jan 04 12:14:20 2016 +0900
@@ -613,10 +613,10 @@
     return;
 
   id = instance->info->id;
-  event_data.slider_value = (int) call_data;
+  event_data.slider_value = (int) (long) call_data;
   event_data.time = 0;
 
-  if ((int) call_data > 0)
+  if ((int) (long) call_data > 0)
     /* event_data.action = SCROLLBAR_PAGE_DOWN;*/
     event_data.action = SCROLLBAR_LINE_DOWN;
   else