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/networking/udhcp/script.c b/networking/udhcp/script.c
index 8c49334..5a4b33a 100644
--- a/networking/udhcp/script.c
+++ b/networking/udhcp/script.c
@@ -149,10 +149,10 @@
 
 	envp = xzalloc(sizeof(char *) * (num_options + 5));
 	j = 0;
-	envp[j++] = bb_xasprintf("interface=%s", client_config.interface);
-	envp[j++] = bb_xasprintf("PATH=%s",
+	envp[j++] = xasprintf("interface=%s", client_config.interface);
+	envp[j++] = xasprintf("PATH=%s",
 		getenv("PATH") ? : "/bin:/usr/bin:/sbin:/usr/sbin");
-	envp[j++] = bb_xasprintf("HOME=%s", getenv("HOME") ? : "/");
+	envp[j++] = xasprintf("HOME=%s", getenv("HOME") ? : "/");
 
 	if (packet == NULL) return envp;
 
@@ -170,7 +170,7 @@
 		/* Fill in a subnet bits option for things like /24 */
 		if (dhcp_options[i].code == DHCP_SUBNET) {
 			memcpy(&subnet, temp, 4);
-			envp[j++] = bb_xasprintf("mask=%d", mton(&subnet));
+			envp[j++] = xasprintf("mask=%d", mton(&subnet));
 		}
 	}
 	if (packet->siaddr) {
@@ -180,12 +180,12 @@
 	if (!(over & FILE_FIELD) && packet->file[0]) {
 		/* watch out for invalid packets */
 		packet->file[sizeof(packet->file) - 1] = '\0';
-		envp[j++] = bb_xasprintf("boot_file=%s", packet->file);
+		envp[j++] = xasprintf("boot_file=%s", packet->file);
 	}
 	if (!(over & SNAME_FIELD) && packet->sname[0]) {
 		/* watch out for invalid packets */
 		packet->sname[sizeof(packet->sname) - 1] = '\0';
-		envp[j++] = bb_xasprintf("sname=%s", packet->sname);
+		envp[j++] = xasprintf("sname=%s", packet->sname);
 	}
 	return envp;
 }