remove trailing 'dnl' that causes this to break autoconf etc by foamdino · Pull Request #11212 · curl/curl

This trailing dnl causes the following error when used as an automake extension /usr/bin/m4:mk/m4ext/ax_libcurl.m4:275: Warning: end of file treated as newline autom4te: error: /usr/bin/m4 failed w...