raco pkg: use 'secure for an HTTPS catalog

racket/collects/net/git-checkout.rkt

@@ -7,7 +7,6 @@
          file/gunzip
          file/private/check-path
          openssl/sha1
-         openssl
          net/url
          net/head
          net/http-client
@@ -282,11 +281,10 @@
 (define (ssl-context verify?)
   (cond
    [(or (not verify?)
-        (getenv "GIT_SSL_NO_VERIFY")
-        (not ssl-available?))
+        (getenv "GIT_SSL_NO_VERIFY"))
     (current-https-protocol)]
    [else
-    (ssl-secure-client-context)]))
+    'secure]))
 
 ;; ----------------------------------------
 

racket/collects/pkg/private/network.rkt

@@ -1,5 +1,6 @@
 #lang racket/base
 (require net/url
+         net/url-connect
          racket/format
          "print.rkt"
          "config.rkt")
@@ -57,9 +58,10 @@
        (lambda (f) (f)))
    (lambda ()
      (define-values (p hs)
-       (get-pure-port/headers url headers
-                              #:redirections 25
-                              #:status? #t))
+       (parameterize ([current-https-protocol 'secure])
+         (get-pure-port/headers url headers
+                                #:redirections 25
+                                #:status? #t)))
      (define status (string->number (substring hs 9 12)))
      (cond
       [(memv status success-codes)