fix building on 64-bit platforms broken in r1900

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 d8425b9..c7c6de1 100644
--- a/src/http/modules/perl/ngx_http_perl_module.c
+++ b/src/http/modules/perl/ngx_http_perl_module.c
@@ -668,7 +668,7 @@
     XPUSHs(sv);
 
     if (args) {
-        EXTEND(sp, (int) args[0]);
+        EXTEND(sp, (intptr_t) args[0]);
 
         for (i = 1; i <= (ngx_uint_t) args[0]; i++) {
             PUSHs(sv_2mortal(args[i]));