Adjusted default value of types_hash_bucket_size (ticket #352).

The ngx_cacheline_size may be too low on some platforms, resulting
in unexpected hash build problems (as no collisions are tolerated due
to low bucket_size, and max_size isn't big enough to build a hash without
collisions).  These problems aren't fatal anymore but nevertheless
need to be addressed.

src/http/ngx_http_core_module.c

diff --git a/src/http/ngx_http_core_module.c b/src/http/ngx_http_core_module.c
index ac83f58..bfaa90e 100644
--- a/src/http/ngx_http_core_module.c
+++ b/src/http/ngx_http_core_module.c
@@ -3710,8 +3710,7 @@
                               prev->types_hash_max_size, 1024);
 
     ngx_conf_merge_uint_value(conf->types_hash_bucket_size,
-                              prev->types_hash_bucket_size,
-                              ngx_cacheline_size);
+                              prev->types_hash_bucket_size, 64);
 
     conf->types_hash_bucket_size = ngx_align(conf->types_hash_bucket_size,
                                              ngx_cacheline_size);