Update to Autoconf 2.57, and Automakify with version 1.7.
* Makefile.am: New file.
* Makefile.in: File removed.
* configure.in: Moved to ...
* configure.ac: ... here. Update for Autoconf 2.5x and Automake.
* aclocal.m4: Moved to ...
* acinclude.m4: ... here. Update for Autoconf 2.5x.
* AUTHORS: New file, makes automake happy.
* autogen.sh: File removed.
* README-CVS: Update to recommend autoreconf instead.
* file.c: HAVE_ST_* -> HAVE_STRUCT_STAT_ST_*.
* net.c: HAVE_SIN6_SCOPE_ID -> HAVE_STRUCT_SOCKADDR_IN6_SIN6_SCOPE_ID,
HAVE_MSG_CONTROL -> HAVE_STRUCT_MSGHDR_MSG_CONTROL.
* strace.c: *_DECLARED -> HAVE_DECL_*
* stream.c: HAVE_* -> HAVE_STRUCT_*