Ignore Permission denied in several places.

On some Androids many of proc files can't actually be opened. So ignore
when opening fails and go on.

diff -u -r ../procps-ng-3.3.14/top/top.c ./top/top.c
--- ../procps-ng-3.3.14/top/top.c	2018-03-03 07:11:55.698869268 +0000
+++ ./top/top.c	2018-05-19 00:20:58.203786150 +0000
@@ -2558,7 +2558,7 @@
       (sorry Linux, but you'll have to close it for us) */
    if (!fp) {
       if (!(fp = fopen("/proc/stat", "r")))
-         error_exit(fmtmk(N_fmt(FAIL_statopn_fmt), strerror(errno)));
+         return;
       /* note: we allocate one more CPU_t via totSLOT than 'cpus' so that a
                slot can hold tics representing the /proc/stat cpu summary */
       Cpu_tics = alloc_c(totSLOT * sizeof(CPU_t));
@@ -4106,7 +4106,7 @@
       tmptty.c_cc[VERASE] = *key_backspace;
 #ifdef TERMIOS_ONLY
    if (-1 == tcsetattr(STDIN_FILENO, TCSAFLUSH, &tmptty))
-      error_exit(fmtmk(N_fmt(FAIL_tty_set_fmt), strerror(errno)));
+      {}
    tcgetattr(STDIN_FILENO, &Tty_tweaked);
 #endif
    // lastly, a nearly raw mode for unsolicited single keystrokes
@@ -4114,7 +4114,7 @@
    tmptty.c_cc[VMIN] = 1;
    tmptty.c_cc[VTIME] = 0;
    if (-1 == tcsetattr(STDIN_FILENO, TCSAFLUSH, &tmptty))
-      error_exit(fmtmk(N_fmt(FAIL_tty_set_fmt), strerror(errno)));
+      {}
    tcgetattr(STDIN_FILENO, &Tty_raw);
 
 #ifndef OFF_STDIOLBF
@@ -5444,7 +5444,7 @@
 
       if (!Numa_node_tot) goto numa_nope;
 
-      if (CHKw(w, View_CPUNOD)) {
+      if (Cpu_tics && CHKw(w, View_CPUNOD)) {
          if (Numa_node_sel < 0) {
             // display the 1st /proc/stat line, then the nodes (if room)
             summary_hlp(&Cpu_tics[smp_num_cpus], N_txt(WORD_allcpus_txt));
@@ -5479,12 +5479,12 @@
          }
       } else
 numa_nope:
-      if (CHKw(w, View_CPUSUM)) {
+      if (Cpu_tics && CHKw(w, View_CPUSUM)) {
          // display just the 1st /proc/stat line
          summary_hlp(&Cpu_tics[Cpu_faux_tot], N_txt(WORD_allcpus_txt));
          Msg_row += 1;
 
-      } else {
+      } else if (Cpu_tics) {
          // display each cpu's states separately, screen height permitting...
          for (i = 0; i < Cpu_faux_tot; i++) {
             snprintf(tmp, sizeof(tmp), N_fmt(WORD_eachcpu_fmt), Cpu_tics[i].id);