Limit CURL to only support HTTP(S) protocols

We don't actually need any other protocols, so lets disable them
to ensure we can't be affected by any vulnerabilities in that part of
the CURL library.

common/kicad_curl/kicad_curl_easy.cpp

@@ -24,6 +24,8 @@
 
 // kicad_curl_easy.h **must be** included before any wxWidgets header to avoid conflicts
 // at least on Windows/msys2
+#include <curl/curl.h>
+#include <curl/easy.h>
 #include <kicad_curl/kicad_curl.h>
 #include <kicad_curl/kicad_curl_easy.h>
 
@@ -112,6 +114,9 @@ KICAD_CURL_EASY::KICAD_CURL_EASY() : m_headers( nullptr )
     curl_easy_setopt( m_CURL, CURLOPT_WRITEFUNCTION, write_callback );
     curl_easy_setopt( m_CURL, CURLOPT_WRITEDATA, (void*) &m_buffer );
 
+    // Only allow HTTP and HTTPS protocols
+    curl_easy_setopt( m_CURL, CURLOPT_PROTOCOLS, CURLPROTO_HTTP | CURLPROTO_HTTPS );
+
     wxPlatformInfo platformInfo;
     wxString application( Pgm().App().GetAppName() );
     wxString version( GetBuildVersion() );