Solaris requires fcntl.h for open() and friends
brltty defines logMessage & friends in log.h

Fixes build errors:

brltty-5.4/Programs/beep_solaris.c: In function 'getKeyboard':
brltty-5.4/Programs/beep_solaris.c:30:21: warning: implicit declaration of
  function 'open' [-Wimplicit-function-declaration]
     if ((keyboard = open("/dev/kbd", O_WRONLY)) != -1) {
                     ^
brltty-5.4/Programs/beep_solaris.c:30:38: error: 'O_WRONLY' undeclared
  (first use in this function)
     if ((keyboard = open("/dev/kbd", O_WRONLY)) != -1) {
                                      ^
brltty-5.4/Programs/beep_solaris.c:32:7: warning: implicit declaration of
  function 'logMessage' [-Wimplicit-function-declaration]
       logMessage(LOG_DEBUG, "keyboard opened: fd=%d", keyboard);
       ^
brltty-5.4/Programs/beep_solaris.c:32:18: error: 'LOG_DEBUG' undeclared
  (first use in this function)
       logMessage(LOG_DEBUG, "keyboard opened: fd=%d", keyboard);
                  ^
brltty-5.4/Programs/beep_solaris.c:34:7: warning: implicit declaration of
  function 'logSystemError' [-Wimplicit-function-declaration]
       logSystemError("keyboard open");
       ^

brltty-5.4/Programs/pcm_audio.c: In function 'openPcmDevice':
brltty-5.4/Programs/pcm_audio.c:40:32: warning: implicit declaration of
  function 'open' [-Wimplicit-function-declaration]
     if ((pcm->fileDescriptor = open(device, O_WRONLY|O_NONBLOCK)) != -1) {
                                ^
brltty-5.4/Programs/pcm_audio.c:40:45: error: 'O_WRONLY' undeclared
  (first use in this function)
     if ((pcm->fileDescriptor = open(device, O_WRONLY|O_NONBLOCK)) != -1) {
                                             
brltty-5.4/Programs/pcm_audio.c:40:54: error: 'O_NONBLOCK' undeclared
  (first use in this function)
     if ((pcm->fileDescriptor = open(device, O_WRONLY|O_NONBLOCK)) != -1) {
                                                      ^
brltty-5.4/Programs/pcm_audio.c:56:61: warning: implicit declaration of
  function 'strerror' [-Wimplicit-function-declaration]
         logMessage(errorLevel, "Cannot set audio info: %s", strerror(errno));
                                                             ^
brltty-5.4/Programs/pcm_audio.c:56:70: error: 'errno' undeclared
  (first use in this function)
         logMessage(errorLevel, "Cannot set audio info: %s", strerror(errno));
                                                                      ^

Accepted upstream for release after 5.4:
https://github.com/brltty/brltty/pull/84

--- brltty-5.4/Programs/beep_solaris.c
+++ brltty-5.4/Programs/beep_solaris.c
@@ -18,6 +18,8 @@
 
 #include "prologue.h"
+#include "log.h"
 
+#include <fcntl.h>
 #include <sys/kbio.h>
 #include <sys/kbd.h>
 
--- brltty-5.4/Programs/pcm_audio.c
+++ brltty-5.4/Programs/pcm_audio.c
@@ -19,5 +19,8 @@
 #include "prologue.h"
 
+#include <string.h>
+#include <errno.h>
+#include <fcntl.h>
 #include <sys/audio.h>
 #include <stropts.h>