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

packages/vms/Makefile.am

 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