Autogen error for autoreconf could be more helpful

Hi, minor nitpick but when I pulled and re-ran tor's autogen it failed due to a new dependency...

atagar@odin:~/Desktop/tor/tor$ ./autogen.sh 
Can't exec "libtoolize": No such file or directory at /usr/bin/autoreconf line 196.
Use of uninitialized value in pattern match (m//) at /usr/bin/autoreconf line 196.

This is all well and good, but we usually provide a more helpful error message (preferably including the debian package the person needs). The following did the trick for me...

sudo apt-get install dh-autoreconf

Cheers! -Damian