* merges:
Conditional automake init
Small configure.ac fix
Fix info/Makefile.am for old automake
Allow m4 and autostuff to be customized
Enforce makeinfo version
Improve TTY library detection
Improve TTY section of summary
Add builtin tty support option
Forward compatible info in builddir (when CLEANFILES becomes obsolete)
Attempt to provide speed_t
Improve term initialization output
Provide helper defines
Allow for ncurses tinfo as TTY option