FS-2936: don't allow using system libcurl on systems that strip out Curl_setopt, we use it

configure.in

@@ -803,6 +803,16 @@ if test "$_libcurl_with" = "yes" ; then
   ac_cv_use_system_curl=yes;
 fi
 
+if test "$ac_cv_use_system_curl" = "yes" ; then
+AC_CACHE_CHECK([whether to use system libcurl library], [ac_cv_curl_usable], [
+  AC_CHECK_LIB(curl, Curl_setopt, [ac_cv_curl_usable="yes"], [ac_cv_curl_usable="no"])
+])
+fi
+
+if test "$ac_cv_curl_usable" != "yes" ; then
+  ac_cv_use_system_curl=no;
+fi
+
 if test "$ac_cv_use_system_curl" != "yes" ; then
  LIBCURL_DEPS='${switch_builddir}/libs/curl/lib/libcurl.la'
  LIBCURL='${switch_builddir}/libs/curl/lib/libcurl.la'