Update internal curl to 7.54.0

Makefile

@@ -625,9 +625,9 @@ ifdef MINGW
       ifeq ($(USE_LOCAL_HEADERS),1)
         CLIENT_CFLAGS += -DCURL_STATICLIB
         ifeq ($(ARCH),x86_64)
-          CLIENT_LIBS += $(LIBSDIR)/win64/libcurl.a
+          CLIENT_LIBS += $(LIBSDIR)/win64/libcurl.a -lcrypt32
         else
-          CLIENT_LIBS += $(LIBSDIR)/win32/libcurl.a
+          CLIENT_LIBS += $(LIBSDIR)/win32/libcurl.a -lcrypt32
         endif
       else
         CLIENT_LIBS += $(CURL_LIBS)

code/client/cl_curl.h

@@ -28,7 +28,7 @@ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 #include "../qcommon/qcommon.h"
 
 #ifdef USE_LOCAL_HEADERS
-  #include "../libcurl-7.35.0/curl/curl.h"
+  #include "../curl-7.54.0/include/curl/curl.h"
 #else
   #include <curl/curl.h>
 #endif

code/curl-7.54.0/include/README

@@ -0,0 +1,55 @@
+                                  _   _ ____  _
+                              ___| | | |  _ \| |
+                             / __| | | | |_) | |
+                            | (__| |_| |  _ <| |___
+                             \___|\___/|_| \_\_____|
+
+Include files for libcurl, external users.
+
+They're all placed in the curl subdirectory here for better fit in any kind
+of environment. You must include files from here using...
+
+        #include <curl/curl.h>
+
+... style and point the compiler's include path to the directory holding the
+curl subdirectory. It makes it more likely to survive future modifications.
+
+NOTE FOR LIBCURL HACKERS
+
+The following notes apply to libcurl version 7.19.0 and later.
+
+* The distributed curl/curlbuild.h file is only intended to be used on systems
+  which can not run the also distributed configure script.
+
+* The distributed curlbuild.h file is generated as a copy of curlbuild.h.dist
+  when the libcurl source code distribution archive file is originally created.
+
+* If you check out from git on a non-configure platform, you must run the
+  appropriate buildconf* script to set up curlbuild.h and other local files
+  before being able of compiling the library.
+
+* On systems capable of running the configure script, the configure process
+  will overwrite the distributed include/curl/curlbuild.h file with one that
+  is suitable and specific to the library being configured and built, which
+  is generated from the include/curl/curlbuild.h.in template file.
+
+* If you intend to distribute an already compiled libcurl library you _MUST_
+  also distribute along with it the generated curl/curlbuild.h which has been
+  used to compile it. Otherwise the library will be of no use for the users of
+  the library that you have built. It is _your_ responsibility to provide this
+  file. No one at the curl project can know how you have built the library.
+
+* File curl/curlbuild.h includes platform and configuration dependent info,
+  and must not be modified by anyone. Configure script generates it for you.
+
+* We cannot assume anything else but very basic compiler features being
+  present. While libcurl requires an ANSI C compiler to build, some of the
+  earlier ANSI compilers clearly can't deal with some preprocessor operators.
+
+* Newlines must remain unix-style for older compilers' sake.
+
+* Comments must be written in the old-style /* unnested C-fashion */
+
+To figure out how to do good and portable checks for features, operating
+systems or specific hardwarare, a very good resource is Bjorn Reese's
+collection at http://predef.sf.net/