configure.ac: set lower depencency on autoconf 2.63 (shouldn't require any change)
configure.ac: set lower depencency on autoconf 2.63 (shouldn't require any
change)

mrmichalis/libtorrent-code,mildred/rasterbar-libtorrent,mrmichalis/libtorrent-code,mildred/rasterbar-libtorrent,mildred/rasterbar-libtorrent,mildred/rasterbar-libtorrent,mrmichalis/libtorrent-code,mildred/rasterbar-libtorrent,mrmichalis/libtorrent-code,mrmichalis/libtorrent-code,mrmichalis/libtorrent-code,mildred/rasterbar-libtorrent