Remove bb_ prefixes from xfuncs.c (and a few other places), consolidate

things like xasprintf() into xfuncs.c, remove xprint_file_by_name() (it only
had one user), clean up lots of #includes...  General cleanup pass.  What I've
been doing for the last couple days.

And it conflicts!  I've removed httpd.c from this checkin due to somebody else
touching that file.  It builds for me.  I have to catch a bus.  (Now you know
why I'm looking forward to Mercurial.)

coreutils/head.c

@@ -11,11 +11,6 @@
 /* BB_AUDIT GNU compatible -c, -q, and -v options in 'fancy' configuration. */
 /* http://www.opengroup.org/onlinepubs/007904975/utilities/head.html */
 
-#include <stdio.h>
-#include <stdlib.h>
-#include <limits.h>
-#include <ctype.h>
-#include <unistd.h>
 #include "busybox.h"
 
 static const char head_opts[] =
@@ -137,7 +132,7 @@ int head_main(int argc, char **argv)
 				bb_perror_msg("%s", *argv);	/* Avoid multibyte problems. */
 				retval = EXIT_FAILURE;
 			}
-			bb_xferror_stdout();
+			xferror_stdout();
 		}
 		fmt = header_fmt_str;
 	} while (*++argv);