tool_cb_hdr: with -J, use the redirect name as a backup

The -J / --remote-header-name logic now records the file name part used
in the redirects so that it can use the last one as a name if no
Content-Disposition header arrives.

Add tests to verify:

1641: -J with a redirect and extract the CD contents in the second
response

1642: -J with a redirect but no Content-Disposition, use the name from
the Location: header

1643: -J with two redirects, using the last file name and also use
queries and fragments to verify them stripped off

Closes #20430

tests/data/test1643

@@ -0,0 +1,71 @@
+<?xml version="1.0" encoding="US-ASCII"?>
+<testcase>
+<info>
+<keywords>
+HTTP
+HTTP GET
+-J
+</keywords>
+</info>
+
+<reply>
+<data nocheck="yes">
+HTTP/1.1 301 OK
+Location: go/here/%TESTNUMBER0002#first
+
+</data>
+<data2 nocheck="yes">
+HTTP/1.1 301 OK
+Location: too/%TESTNUMBER0003?fooo#second/%TESTNUMBER0003
+
+</data2>
+<data3 nocheck="yes">
+HTTP/1.1 200 OK
+Date: Tue, 09 Nov 2010 14:49:00 GMT
+Server: test-server/fake
+Content-Length: 6
+Connection: close
+Content-Type: text/html
+
+12345
+</data3>
+</reply>
+
+# Client-side
+<client>
+<server>
+http
+</server>
+<name>
+HTTP -J, two redirects, use the last Location: name
+</name>
+<command option="no-output,no-include">
+http://%HOSTIP:%HTTPPORT/%TESTNUMBER -J -L -O --output-dir %LOGDIR
+</command>
+</client>
+
+# Verify data after the test has been "shot"
+<verify>
+<protocol crlf="headers">
+GET /%TESTNUMBER HTTP/1.1
+Host: %HOSTIP:%HTTPPORT
+User-Agent: curl/%VERSION
+Accept: */*
+
+GET /go/here/%TESTNUMBER0002 HTTP/1.1
+Host: %HOSTIP:%HTTPPORT
+User-Agent: curl/%VERSION
+Accept: */*
+
+GET /go/here/too/%TESTNUMBER0003?fooo HTTP/1.1
+Host: %HOSTIP:%HTTPPORT
+User-Agent: curl/%VERSION
+Accept: */*
+
+</protocol>
+<file name="%LOGDIR/%TESTNUMBER0003">
+12345
+</file>
+
+</verify>
+</testcase>