packages/vms/Makefile.am: add latest file additions to EXTRA_DIST

EXTRA_DIST = \

 build_vms.com \

 clean_gnv_curl.com \

 config_h.com \

 curl_gnv_build_steps.txt \

 curlmsg.h \

 curlmsg.msg \

 curlmsg.sdl \

 curlmsg_vms.h \

 generate_config_vms_h_curl.com \

 readme

 gnv_curl_configure.sh \

 make_gnv_curl_install.sh \

 readme \

 setup_gnv_curl_build.com