rtcd.pl: check for auto_help availability
rtcd.pl: check for auto_help availability

'auto_help' was added to Getopt::Long in 2.33
this isn't strictly necessary as an unrecognized option (--help) will
issue a warning and then print the usage

Change-Id: Ia757553a4e19d22a8eb70768a8866ab1a76a0eec

jmvalin/aom,lyx2014/libvpx_c,iniwf/webm.libvpx,ittiamvpx/libvpx,abwiz0086/webm.libvpx,jacklicn/webm.libvpx,GrokImageCompression/aom,Distrotech/libvpx,altogother/webm.libvpx,abwiz0086/webm.libvpx,Laknot/libvpx,altogother/webm.libvpx,goodleixiao/vpx,luctrudeau/aom,webmproject/libvpx,reimaginemedia/webm.libvpx,Distrotech/libvpx,mbebenita/aom,kalli123/webm.libvpx,mbebenita/aom,ittiamvpx/libvpx,liqianggao/libvpx,kalli123/webm.libvpx,iniwf/webm.libvpx,matanbs/vp982,jdm/libvpx,Maria1099/webm.libvpx,luctrudeau/aom,luctrudeau/aom,reimaginemedia/webm.libvpx,Suvarna1488/webm.libvpx,Laknot/libvpx,abwiz0086/webm.libvpx,shyamalschandra/libvpx,felipebetancur/libvpx,altogother/webm.libvpx,stewnorriss/libvpx,matanbs/webm.libvpx,smarter/aom,Acidburn0zzz/webm.libvpx,webmproject/libvpx,hsueceumd/test_hui,kalli123/webm.libvpx,iniwf/webm.libvpx,ShiftMediaProject/libvpx,webmproject/libvpx,pcwalton/libvpx,mwgoldsmith/libvpx,shacklettbp/aom,stewnorriss/libvpx,altogother/webm.libvpx,stewnorriss/libvpx,kim42083/webm.libvpx,VTCSecureLLC/libvpx,Maria1099/webm.libvpx,shacklettbp/aom,matanbs/webm.libvpx,iniwf/webm.libvpx,Acidburn0zzz/webm.libvpx,Distrotech/libvpx,ShiftMediaProject/libvpx,hsueceumd/test_hui,Acidburn0zzz/webm.libvpx,ittiamvpx/libvpx-1,running770/libvpx,thdav/aom,running770/libvpx,Laknot/libvpx,gshORTON/webm.libvpx,Topopiccione/libvpx,shyamalschandra/libvpx,ShiftMediaProject/libvpx,GrokImageCompression/aom,goodleixiao/vpx,reimaginemedia/webm.libvpx,hsueceumd/test_hui,VTCSecureLLC/libvpx,Maria1099/webm.libvpx,GrokImageCompression/aom,kalli123/webm.libvpx,jacklicn/webm.libvpx,thdav/aom,Laknot/libvpx,openpeer/libvpx_new,zofuthan/libvpx,mbebenita/aom,jdm/libvpx,liqianggao/libvpx,matanbs/vp982,n4t/libvpx,openpeer/libvpx_new,kim42083/webm.libvpx,gshORTON/webm.libvpx,shacklettbp/aom,kleopatra999/webm.libvpx,GrokImageCompression/aom,Laknot/libvpx,openpeer/libvpx_new,luctrudeau/aom,running770/libvpx,jmvalin/aom,VTCSecureLLC/libvpx,shyamalschandra/libvpx,felipebetancur/libvpx,jacklicn/webm.libvpx,hsueceumd/test_hui,goodleixiao/vpx,Acidburn0zzz/webm.libvpx,ittiamvpx/libvpx-1,stewnorriss/libvpx,reimaginemedia/webm.libvpx,liqianggao/libvpx,felipebetancur/libvpx,mbebenita/aom,shareefalis/libvpx,jmvalin/aom,matanbs/webm.libvpx,charup/https---github.com-webmproject-libvpx-,smarter/aom,matanbs/vp982,openpeer/libvpx_new,jmvalin/aom,Topopiccione/libvpx,Laknot/libvpx,lyx2014/libvpx_c,Suvarna1488/webm.libvpx,mwgoldsmith/vpx,pcwalton/libvpx,kim42083/webm.libvpx,zofuthan/libvpx,shareefalis/libvpx,webmproject/libvpx,liqianggao/libvpx,lyx2014/libvpx_c,Topopiccione/libvpx,zofuthan/libvpx,mbebenita/aom,shareefalis/libvpx,ittiamvpx/libvpx-1,gshORTON/webm.libvpx,charup/https---github.com-webmproject-libvpx-,mwgoldsmith/vpx,charup/https---github.com-webmproject-libvpx-,smarter/aom,mwgoldsmith/libvpx,matanbs/vp982,reimaginemedia/webm.libvpx,Maria1099/webm.libvpx,shareefalis/libvpx,stewnorriss/libvpx,mbebenita/aom,ittiamvpx/libvpx,kleopatra999/webm.libvpx,thdav/aom,mwgoldsmith/vpx,n4t/libvpx,kleopatra999/webm.libvpx,matanbs/webm.libvpx,openpeer/libvpx_new,charup/https---github.com-webmproject-libvpx-,charup/https---github.com-webmproject-libvpx-,thdav/aom,kleopatra999/webm.libvpx,abwiz0086/webm.libvpx,gshORTON/webm.libvpx,luctrudeau/aom,openpeer/libvpx_new,shyamalschandra/libvpx,smarter/aom,Topopiccione/libvpx,mwgoldsmith/libvpx,ShiftMediaProject/libvpx,thdav/aom,shareefalis/libvpx,lyx2014/libvpx_c,shacklettbp/aom,mwgoldsmith/vpx,jdm/libvpx,mwgoldsmith/vpx,ittiamvpx/libvpx-1,ittiamvpx/libvpx,hsueceumd/test_hui,charup/https---github.com-webmproject-libvpx-,mbebenita/aom,liqianggao/libvpx,ittiamvpx/libvpx,kalli123/webm.libvpx,kim42083/webm.libvpx,zofuthan/libvpx,matanbs/vp982,Suvarna1488/webm.libvpx,ittiamvpx/libvpx-1,Topopiccione/libvpx,pcwalton/libvpx,abwiz0086/webm.libvpx,reimaginemedia/webm.libvpx,ittiamvpx/libvpx-1,gshORTON/webm.libvpx,Suvarna1488/webm.libvpx,hsueceumd/test_hui,shareefalis/libvpx,gshORTON/webm.libvpx,goodleixiao/vpx,shyamalschandra/libvpx,ittiamvpx/libvpx,kalli123/webm.libvpx,pcwalton/libvpx,kleopatra999/webm.libvpx,iniwf/webm.libvpx,iniwf/webm.libvpx,smarter/aom,jdm/libvpx,lyx2014/libvpx_c,thdav/aom,felipebetancur/libvpx,n4t/libvpx,Maria1099/webm.libvpx,goodleixiao/vpx,webmproject/libvpx,altogother/webm.libvpx,pcwalton/libvpx,Acidburn0zzz/webm.libvpx,abwiz0086/webm.libvpx,matanbs/webm.libvpx,shacklettbp/aom,GrokImageCompression/aom,matanbs/vp982,n4t/libvpx,zofuthan/libvpx,jmvalin/aom,Distrotech/libvpx,Maria1099/webm.libvpx,jacklicn/webm.libvpx,Suvarna1488/webm.libvpx,altogother/webm.libvpx,running770/libvpx,mbebenita/aom,Acidburn0zzz/webm.libvpx,goodleixiao/vpx,liqianggao/libvpx,pcwalton/libvpx,mwgoldsmith/libvpx,luctrudeau/aom,stewnorriss/libvpx,VTCSecureLLC/libvpx,Suvarna1488/webm.libvpx,jacklicn/webm.libvpx,zofuthan/libvpx,lyx2014/libvpx_c,running770/libvpx,Topopiccione/libvpx,matanbs/webm.libvpx,running770/libvpx,VTCSecureLLC/libvpx,shyamalschandra/libvpx,GrokImageCompression/aom,webmproject/libvpx,jdm/libvpx,felipebetancur/libvpx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