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 '--exclude=config.log' -ur src-orig/proc/sysinfo.c src/proc/sysinfo.c
--- src-orig/proc/sysinfo.c	2017-08-26 23:22:50.704748922 +0200
+++ src/proc/sysinfo.c	2017-08-27 00:08:52.482479053 +0200
@@ -97,6 +97,10 @@
     char *savelocale;
 #endif
 
+    if (uptime_fd == -1 && (uptime_fd = open(UPTIME_FILE, O_RDONLY)) == -1) {
+	return 0;
+    }
+
     FILE_TO_BUF(UPTIME_FILE,uptime_fd);
 #ifndef __ANDROID__
     savelocale = strdup(setlocale(LC_NUMERIC, NULL));
@@ -130,6 +136,7 @@
     /* /proc/stat can get very large on multi-CPU systems so we
        can't use FILE_TO_BUF */
     if (!(f = fopen(STAT_FILE, "r"))) {
+	return 0;
 	fputs(BAD_OPEN_MESSAGE, stderr);
 	fflush(NULL);
 	_exit(102);
@@ -389,6 +401,10 @@
     char *savelocale;
 #endif
 
+    if (loadavg_fd == -1 && (loadavg_fd = open(LOADAVG_FILE, O_RDONLY)) == -1) {
+	return;
+    }
+
     FILE_TO_BUF(LOADAVG_FILE,loadavg_fd);
 #ifndef __ANDROID__
     savelocale = strdup(setlocale(LC_NUMERIC, NULL));
diff '--exclude=config.log' -ur src-orig/top/top.c src/top/top.c
--- src-orig/top/top.c	2017-08-26 23:22:50.708748956 +0200
+++ src/top/top.c	2017-08-27 00:13:34.416643298 +0200
@@ -2379,7 +2379,7 @@
       (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 NULL;
       /* note: we allocate one more CPU_t via totSLOT than 'cpus' so that a
                slot can hold tics representing the /proc/stat cpu summary */
       cpus = alloc_c(totSLOT * sizeof(CPU_t));
@@ -3814,7 +3814,7 @@
       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
@@ -3822,7 +3822,7 @@
    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
@@ -5155,7 +5155,7 @@
 #ifndef NUMA_DISABLE
       if (!Numa_node_tot) goto numa_nope;
 
-      if (CHKw(w, View_CPUNOD)) {
+      if (smpcpu && CHKw(w, View_CPUNOD)) {
          if (Numa_node_sel < 0) {
             // display the 1st /proc/stat line, then the nodes (if room)
             summary_hlp(&smpcpu[smp_num_cpus], N_txt(WORD_allcpus_txt));
@@ -5191,12 +5191,12 @@
       } else
 numa_nope:
 #endif
-      if (CHKw(w, View_CPUSUM)) {
+      if (smpcpu && CHKw(w, View_CPUSUM)) {
          // display just the 1st /proc/stat line
          summary_hlp(&smpcpu[Cpu_faux_tot], N_txt(WORD_allcpus_txt));
          Msg_row += 1;
 
-      } else {
+      } else if (smpcpu) {
          // 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), smpcpu[i].id);