change BSD ifndefs to __OpenBSD__ and remove unnecessary ifdefs

I'm not sure if any operating system other than OpenBSD
has strlcpy/strlcat. May need to use a configure script
for this later on.

lcl.c

@@ -9,7 +9,7 @@
 #include <unistd.h>
 #include <libgen.h>
 #include <errno.h>
-#ifdef BSD
+#ifdef __OpenBSD__
 #	include <string.h>
 #endif
 

lfs.c

@@ -12,9 +12,7 @@
 #include <libgen.h>
 #include <stdio.h>
 #include <stdlib.h>
-#ifdef BSD
 #include <string.h>
-#endif
 #include <unistd.h>
 
 #include <lua.h>

lprocess.c

@@ -1,6 +1,6 @@
 /***
- * Processes, signals, and
+ * Processes, signals, and signal handlers.
- * signal handlers.
+ *
  * @module process
  */
 
@@ -9,7 +9,7 @@
 #include <signal.h>
 #include <string.h>
 #include <errno.h>
-#ifdef BSD
+#ifdef __OpenBSD__
 #	include <string.h>
 #endif
 

util.c

@@ -37,7 +37,7 @@ lfailm(lua_State *L, const char *mesg)
  * lib/libc/string/strlcat.c and
  * lib/libc/string/strlcpy.c respectively
  */
-#ifndef BSD
+#ifndef __OpenBSD__
 
 /*
  * Appends src to string dst of size dsize (unlike strncat, dsize is the

util.h

@@ -2,13 +2,13 @@
 
 #define _UTIL_H_
 
-#include <string.h>
+#include <stddef.h>
 #include <lua.h>
 
 int lfail(lua_State *);
 int lfailm(lua_State *, const char *);
 
-#ifndef BSD
+#ifndef __OpenBSD__
 size_t strlcat(char *, const char *, size_t);
 size_t strlcpy(char *, const char *, size_t);
 #endif