delete ngx_http_perl_cleanup_t unused since r909

src/http/modules/perl/ngx_http_perl_module.c

diff --git a/src/http/modules/perl/ngx_http_perl_module.c b/src/http/modules/perl/ngx_http_perl_module.c
index 9cdd175..e1388f1 100644
--- a/src/http/modules/perl/ngx_http_perl_module.c
+++ b/src/http/modules/perl/ngx_http_perl_module.c
@@ -30,12 +30,6 @@
 } ngx_http_perl_variable_t;
 
 
-typedef struct {
-    SV                *sv;
-    PerlInterpreter   *perl;
-} ngx_http_perl_cleanup_t;
-
-
 #if (NGX_HTTP_SSI)
 static ngx_int_t ngx_http_perl_ssi(ngx_http_request_t *r,
     ngx_http_ssi_ctx_t *ssi_ctx, ngx_str_t **params);