http: better error message for HTTP/1.x response without status line

If a response without a status line is received, and the connection is
known to use HTTP/1.x (not HTTP/0.9), report the error "Invalid status
line" instead of "Received HTTP/0.9 when not allowed".

Closes #13045

tests/data/test1479

@@ -0,0 +1,67 @@
+<testcase>
+<info>
+<keywords>
+HTTP
+HTTP/0.9
+</keywords>
+</info>
+
+#
+# Server-side
+<reply>
+<data>
+HTTP/1.1 200 OK
+Content-Length: 5
+
+Data
+</data>
+<data2>
+Data
+Data
+Data
+</data2>
+<datacheck>
+</datacheck>
+</reply>
+
+#
+# Client-side
+<client>
+<server>
+http
+</server>
+<name>
+HTTP/1.1 response followed by an HTTP/0.9 response over the same connection
+</name>
+<command>
+http://%HOSTIP:%HTTPPORT/%TESTNUMBER http://%HOSTIP:%HTTPPORT/%TESTNUMBER0002
+</command>
+</client>
+
+#
+# Verify data after the test has been "shot"
+<verify>
+<protocol>
+GET /%TESTNUMBER HTTP/1.1
+Host: %HOSTIP:%HTTPPORT
+User-Agent: curl/%VERSION
+Accept: */*
+
+GET /%TESTNUMBER0002 HTTP/1.1
+Host: %HOSTIP:%HTTPPORT
+User-Agent: curl/%VERSION
+Accept: */*
+
+</protocol>
+
+# Hyper curl returns unsupported protocol
+# built-in curl returns weird_server_reply
+<errorcode>
+%if hyper
+1
+%else
+8
+%endif
+</errorcode>
+</verify>
+</testcase>