elb does not pass -DHAVE_CURL when compiling el_runtime.c, so all
http_get/http_post calls from El code return the no-op error string
instead of making real HTTP requests. This breaks the chat proxy to
soul-demo at localhost:7772.
After elb runs (and generates all intermediate .c files in dist/),
recompile el_runtime.c with -DHAVE_CURL and relink the entire binary
from those generated files. Verifies curl_easy_init is present in the
output binary before proceeding.
will.anderson