ftp/wget: Fix makeinfo path

On FreeBSD 10.x makeinfo is located in /usr/bin/makeinfo, whereas on 11.x
it is located in /usr/local/bin/makeinfo. Don't specify its full path
location like DOCS_CONFIGURE_ENV= MAKEINFO="${LOCALBASE}/bin/makeinfo"
since having it in PATH (either in /usr/bin or /usr/local/bin) suffices.

Reported by: Walter Schwarzenfeld <w.schwarzenfeld@utanet.at>