Header fixes:

* Do not include system headers in shared files (stdlib.h).
* Don't include lcd.h only once in each driver.
* Remove some unnecessary headers from driver (e.g. syslog.h)
* Include <poll.h> instead of <sys/poll.h>
* Spelling fixes.

server/drivers/MtxOrb.c

@@ -48,9 +48,8 @@
 #include <string.h>
 #include <strings.h>
 #include <errno.h>
-#include <syslog.h>
 #include <ctype.h>
-#include <sys/poll.h>
+#include <poll.h>
 
 #ifdef HAVE_CONFIG_H
 # include "config.h"
@@ -118,7 +117,7 @@ typedef struct MtxOrb_private_data {
 	unsigned char *framebuf;
 	unsigned char *backingstore;
 
-	/* defineable characters */
+	/* definable characters */
 	CGmode ccmode;
 
 	int output_state;	/**< current output state */