[tests] use generated date in HTTP If conditionals

replace hard-coded date in HTTP If conditional tests

x-ref:
  "Make tests pass after 2035"
  https://github.com/lighttpd/lighttpd1.4/pull/106

github: closes #106

tests/request.t

@@ -460,10 +460,12 @@ EOF
 $t->{RESPONSE} = [ { 'HTTP-Protocol' => 'HTTP/1.0', 'HTTP-Status' => 400 } ];
 ok($tf->handle_http($t) == 0, 'OPTIONS for RTSP');
 
+my $nextyr = (gmtime(time()))[5] + 1900 + 1;
+
 $t->{REQUEST}  = ( <<EOF
 GET /index.html HTTP/1.0
-If-Modified-Since: Sun, 01 Jan 2036 00:00:02 GMT
-If-Modified-Since: Sun, 01 Jan 2036 00:00:02 GMT
+If-Modified-Since: Sun, 01 Jan $nextyr 00:00:02 GMT
+If-Modified-Since: Sun, 01 Jan $nextyr 00:00:02 GMT
 EOF
  );
 $t->{RESPONSE} = [ { 'HTTP-Protocol' => 'HTTP/1.0', 'HTTP-Status' => 304 } ];
@@ -484,8 +486,8 @@ ok($tf->handle_http($t) == 0, 'broken If-Modified-Since');
 
 $t->{REQUEST}  = ( <<EOF
 GET /index.html HTTP/1.0
-If-Modified-Since2: Sun, 01 Jan 2036 00:00:03 GMT
-If-Modified-Since: Sun, 01 Jan 2036 00:00:02 GMT
+If-Modified-Since2: Sun, 01 Jan $nextyr 00:00:03 GMT
+If-Modified-Since: Sun, 01 Jan $nextyr 00:00:02 GMT
 EOF
  );
 $t->{RESPONSE} = [ { 'HTTP-Protocol' => 'HTTP/1.0', 'HTTP-Status' => 304 } ];
@@ -493,7 +495,7 @@ ok($tf->handle_http($t) == 0, 'Similar Headers (bug #1287)');
 
 $t->{REQUEST}  = ( <<EOF
 GET /index.html HTTP/1.0
-If-Modified-Since: Sun, 01 Jan 2036 00:00:02 GMT
+If-Modified-Since: Sun, 01 Jan $nextyr 00:00:02 GMT
 EOF
  );
 $t->{RESPONSE} = [ { 'HTTP-Protocol' => 'HTTP/1.0', 'HTTP-Status' => 304, 'Content-Type' => 'text/html' } ];
@@ -501,7 +503,7 @@ ok($tf->handle_http($t) == 0, 'If-Modified-Since');
 
 $t->{REQUEST}  = ( <<EOF
 GET /index.html HTTP/1.0
-If-Modified-Since: Sun, 01 Jan 2036 00:00:02 GMT
+If-Modified-Since: Sun, 01 Jan $nextyr 00:00:02 GMT
 EOF
  );
 $t->{RESPONSE} = [ { 'HTTP-Protocol' => 'HTTP/1.0', 'HTTP-Status' => 304, '-Content-Length' => '' } ];