LICENSE-MIXING: update URLs

* use SSL/TLS where available
* follow permanent redirects

docs/LICENSE-MIXING

@@ -23,7 +23,7 @@ libcurl http://curl.haxx.se/docs/copyright.html
         Uses an MIT (or Modified BSD)-style license that is as liberal as
         possible.
 
-OpenSSL http://www.openssl.org/source/license.html
+OpenSSL https://www.openssl.org/source/license.html
 
         (May be used for SSL/TLS support) Uses an Original BSD-style license
         with an announcement clause that makes it "incompatible" with GPL. You
@@ -39,13 +39,13 @@ GnuTLS  http://www.gnutls.org/
         GnuTLS itself depends on and uses other libs (libgcrypt and
         libgpg-error) and they too are LGPL- or GPL-licensed.
 
-WolfSSL   http://www.wolfssl.com/
+WolfSSL   https://www.wolfssl.com/
 
         (May be used for SSL/TLS support) Uses the GPL[1] license or a
         propietary license. If this is a problem for you, consider using
         another TLS library.
 
-NSS     http://www.mozilla.org/projects/security/pki/nss/
+NSS     https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS
 
         (May be used for SSL/TLS support) Is covered by the MPL[4] license,
         the GPL[1] license and the LGPL[3] license. You may choose to license
@@ -79,7 +79,7 @@ c-ares  http://daniel.haxx.se/projects/c-ares/license.html
         liberal and imposes no restrictions on any other library or part you
         may link with.
 
-zlib    http://www.gzip.org/zlib/zlib_license.html
+zlib    http://www.zlib.net/zlib_license.html
 
         (Used for compressed Transfer-Encoding support) Uses an MIT-style
         license that shouldn't collide with any other library.
@@ -89,12 +89,12 @@ MIT Kerberos http://web.mit.edu/kerberos/www/dist/
         (May be used for GSS support) MIT licensed, that shouldn't collide
         with any other parts.
 
-Heimdal http://www.pdc.kth.se/heimdal/
+Heimdal http://www.h5l.org
 
         (May be used for GSS support) Heimdal is Original BSD licensed with
         the announcement clause.
 
-GNU GSS http://www.gnu.org/software/gss/
+GNU GSS https://www.gnu.org/software/gss/
 
         (May be used for GSS support) GNU GSS is GPL licensed. Note that you
         may not distribute binary curl packages that uses this if you build
@@ -121,10 +121,10 @@ libssh2 http://www.libssh2.org/
         (Used for scp and sftp support) libssh2 uses a Modified BSD-style
         license.
 
-[1] = GPL - GNU General Public License: http://www.gnu.org/licenses/gpl.html
-[2] = http://www.fsf.org/licenses/gpl-faq.html#GPLIncompatibleLibs details on
+[1] = GPL - GNU General Public License: https://www.gnu.org/licenses/gpl.html
+[2] = https://www.gnu.org/licenses/gpl-faq.html#GPLIncompatibleLibs details on
       how to write such an exception to the GPL
 [3] = LGPL - GNU Lesser General Public License:
-      http://www.gnu.org/licenses/lgpl.html
+      https://www.gnu.org/licenses/lgpl.html
 [4] = MPL - Mozilla Public License:
-      http://www.mozilla.org/MPL/
+      https://www.mozilla.org/MPL/