8261652: Remove some dead comments from os_bsd_x86

Reviewed-by: phh
Backport-of: 28163a9

Author: Vladimir Kempik

src/hotspot/os_cpu/bsd_x86/os_bsd_x86.cpp

@@ -64,7 +64,6 @@
 # include <stdio.h>
 # include <unistd.h>
 # include <sys/resource.h>
-# include <pthread.h>
 # include <sys/stat.h>
 # include <sys/time.h>
 # include <sys/utsname.h>
@@ -501,16 +500,6 @@ JVM_handle_bsd_signal(int sig,
       return 1;
     }
   }
-
-/*
-  NOTE: does not seem to work on bsd.
-  if (info == NULL || info->si_code <= 0 || info->si_code == SI_NOINFO) {
-    // can't decode this kind of signal
-    info = NULL;
-  } else {
-    assert(sig == info->si_signo, "bad siginfo");
-  }
-*/
   // decide if this trap can be handled by a stub
   address stub = NULL;