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.)
diff --git a/procps/top.c b/procps/top.c
index bf30c23..1b6f707 100644
--- a/procps/top.c
+++ b/procps/top.c
@@ -29,22 +29,9 @@
  */
 
 #include "busybox.h"
-#include <sys/types.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <string.h>
-#include <sys/ioctl.h>
 
 //#define CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE  /* + 2k */
 
-#ifdef CONFIG_FEATURE_TOP_CPU_USAGE_PERCENTAGE
-#include <time.h>
-#include <fcntl.h>
-#include <netinet/in.h>  /* htons */
-#endif
-
-
 typedef int (*cmp_t)(procps_status_t *P, procps_status_t *Q);
 
 static procps_status_t *top;   /* Hehe */
@@ -116,7 +103,7 @@
 
 static void get_jiffy_counts(void)
 {
-	FILE* fp = bb_xfopen("stat", "r");
+	FILE* fp = xfopen("stat", "r");
 	prev_jif = jif;
 	if (fscanf(fp, "cpu  %lld %lld %lld %lld %lld %lld %lld %lld",
 			&jif.usr,&jif.nic,&jif.sys,&jif.idle,
@@ -196,7 +183,7 @@
 	unsigned int needs_conversion = 1;
 
 	/* read memory info */
-	fp = bb_xfopen("meminfo", "r");
+	fp = xfopen("meminfo", "r");
 
 	/*
 	 * Old kernels (such as 2.4.x) had a nice summary of memory info that
@@ -238,7 +225,7 @@
 	fclose(fp);
 
 	/* read load average as a string */
-	fp = bb_xfopen("loadavg", "r");
+	fp = xfopen("loadavg", "r");
 	buf[0] = '\0';
 	fgets(buf, sizeof(buf), fp);
 	end = strchr(buf, ' ');
@@ -414,7 +401,7 @@
 	}
 
 	/* change to /proc */
-	bb_xchdir("/proc");
+	xchdir("/proc");
 #ifdef CONFIG_FEATURE_USE_TERMIOS
 	tcgetattr(0, (void *) &initial_settings);
 	memcpy(&new_settings, &initial_settings, sizeof(struct termios));