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.)

e2fsprogs/e2p/feature.c

@@ -155,7 +155,7 @@ int e2p_edit_feature(const char *str, __u32 *compat_array, __u32 *ok_array)
 	unsigned int	mask;
 	int		compat_type;
 
-	buf = bb_xstrdup(str);
+	buf = xstrdup(str);
 	cp = buf;
 	while (cp && *cp) {
 		neg = 0;

e2fsprogs/e2p/mntopts.c

@@ -100,7 +100,7 @@ int e2p_edit_mntopts(const char *str, __u32 *mntopts, __u32 ok)
 	int	neg;
 	unsigned int	mask;
 
-	buf = bb_xstrdup(str);
+	buf = xstrdup(str);
 	cp = buf;
 	while (cp && *cp) {
 		neg = 0;

e2fsprogs/e2p/ostype.c

@@ -33,7 +33,7 @@ char *e2p_os2string(int os_type)
 	else
 		os = "(unknown os)";
 
-	ret = bb_xstrdup(os);
+	ret = xstrdup(os);
 	return ret;
 }