No need for nscore.h

(cherry picked from commit 9463913f)
Signed-off-by: Christophe Mutricy <xtophe@videolan.org>

projects/mozilla/support/npunix.c

@@ -42,7 +42,6 @@
 #define OJI 1
 
 #include <stdio.h>
-#include <nscore.h>
 #include <npapi.h>
 #include <npupp.h>
 

projects/mozilla/support/npwin.cpp

@@ -41,7 +41,6 @@
 #   include <mozilla-config.h>
 #endif
 
-#include "nscore.h"
 #include "npapi.h"
 #include "npupp.h"