In the current versions of FreeBSD, the apps of GNU autotools do not need to
be called with a version anymore. The latest version can be invoked directly.
Additionally, the script ./bootstrap.sh asked for autoconf 2.62 and
automake 1.9, versions which are not available as port anymore.

ASTERISK-27637

Change-Id: Id7b94b80e78cc943a40ba79b697e3f70019820a7