debuginfod-client: Use CURLOPT_MAXREDIRS

debuginfod-client: Use CURLOPT_MAXREDIRS

Guard against bad servers. Older libcurl allowed unlimited
redirects. Newer libcurl default to max 30. Explicitly set
CURLOPT_MAXREDIRS to 6 (twice the number of redirects that seems
"reasonable"). This guards against badly setup servers that keep
redirecting. https://curl.se/libcurl/c/CURLOPT_MAXREDIRS.html

	* debuginfod/debuginfod-client.c (init_handle): Add
	CURLOPT_MAXREDIRS curl_easy_setopt_ck.

Signed-off-by: Mark Wielaard <mark@klomp.org>