Maxim Cournoyer authored Apr 16, 2021 and Adrien Béraud committed Apr 16, 2021

Using '--without-webrtc-ap' would still attempt to build the
webrtc-based echo canceler.  Adjust the help string of the option to
match the actual option name.

* configure.ac (webrtcap): Help text changed from --without-webrtc-ap
to --without-webrtcap.

Change-Id: I46a30dc87963ca67b0b135fed08523f16834f715