Define ap_method_mask_t (typedef for apr_uint64_t) and use for method

Define ap_method_mask_t (typedef for apr_uint64_t) and use for method
bitmasks rather than apr_int64_t.  Fixes UBSan errors shifting to the
top bit of a signed integer.

* include/httpd.h: Add ap_method_mask_t, use it for AP_METHOD_BIT.
  (struct ap_method_mask_t): Likewise for method_mask field.
  (struct request_rec): Likewise for allowed field.

* include/http_config.h (struct cmd_parms): Likewise for limited field.

* include/ap_mmn.h: Bump MMN major.

* modules/*/*.c: Adjust all method masks to use ap_method_mask_t.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1874114 13f79535-47bb-0310-9956-ffa450edef68