-J: support ';' in quoted file names

Content-disposition headers can provide file names with semicolons which
previously would be cut off at that point.

Added test case 1311 and 1312 to verify -J.

Bug: http://curl.haxx.se/bug/view.cgi?id=3375603
Reported by: Peter Hjalmarsson

tests/data/test1312

@@ -0,0 +1,64 @@
+<testcase>
+<info>
+<keywords>
+HTTP
+HTTP GET
+-J
+</keywords>
+</info>
+
+#
+<reply>
+<data nocheck="yes">
+HTTP/1.1 200 OK
+Date: Thu, 09 Nov 2010 14:49:00 GMT
+Server: test-server/fake
+Content-Length: 6
+Connection: close
+Content-Type: text/html
+Content-Disposition: inline; filename="name1312;weird"
+
+12345
+</data>
+</reply>
+
+#
+# Client-side
+<client>
+# this relies on the debug feature to allow us to set directory to store the
+# -J output in
+<features>
+debug
+</features>
+<server>
+http
+</server>
+<name>
+HTTP GET with -J, Content-Disposition and ; in filename
+</name>
+<setenv>
+CURL_TESTDIR=%PWD/log
+</setenv>
+<command option="no-output,no-include">
+http://%HOSTIP:%HTTPPORT/1312 -J -O
+</command>
+</client>
+
+#
+# Verify data after the test has been "shot"
+<verify>
+<strip>
+^User-Agent:.*
+</strip>
+<protocol>
+GET /1312 HTTP/1.1
+Host: %HOSTIP:%HTTPPORT
+Accept: */*
+
+</protocol>
+<file name="log/name1312;weird">
+12345
+</file>
+
+</verify>
+</testcase>