Fix Solaris warnings mentioned by Micha on fltk.coredev Sep 16 '13

in thread entitled "Re: STR 2636, clipboard notification".



git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@9977 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

src/Fl_x.cxx

@@ -866,8 +866,8 @@ void Fl::copy(const char *stuff, int len, int clipboard) {
 ////////////////////////////////////////////////////////////////
 // Code for tracking clipboard changes:
 
-static Time primary_timestamp = -1;
+static Time primary_timestamp = (Time)-1;
-static Time clipboard_timestamp = -1;
+static Time clipboard_timestamp = (Time)-1;
 
 extern bool fl_clipboard_notify_empty(void);
 extern void fl_trigger_clipboard_notify(int source);
@@ -949,8 +949,8 @@ void fl_clipboard_notify_change() {
   // Reset the timestamps if we've going idle so that you don't
   // get a bogus immediate trigger next time they're activated.
   if (fl_clipboard_notify_empty()) {
-    primary_timestamp = -1;
+    primary_timestamp = (Time)-1;
-    clipboard_timestamp = -1;
+    clipboard_timestamp = (Time)-1;
   } else {
 #if HAVE_XFIXES
     if (!have_xfixes)