build: fix typo in autoconf help
build: fix typo in autoconf help

Change-Id: Iecd6ae052dad9e55cdf913505ff3302e0e03c298
Signed-off-by: Alon Bar-Lev <2e3ceb4d37adc6ae3ccc00d3646e0e0a036ace03@redhat.com>

alonbl/otopi,alonbl/otopi,alonbl/otopi