Utils: Fix "unreferenced formal parameter" warnings

environment.cpp:438: warning: C4100: 'file2': unreferenced formal
parameter

Change-Id: I6543c1304307826543ef9d8a9eb860df652ae73b
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

src/libs/utils/environment.cpp

@@ -446,6 +446,8 @@ static bool hasSameInode(const QString &file1, const QString &file2)
         return false;
     return stat1.st_ino == stat2.st_ino;
 #else
+    Q_UNUSED(file1)
+    Q_UNUSED(file2)
     return false;
 #endif
 }