[ruby-cvs:78277] 83900528ad (master): Turn C4047 warning into error

Nobuyoshi Nakada	2019-11-20 16:23:59 +0900 (Wed, 20 Nov 2019)

  New Revision: 83900528ad

  https://github.com/ruby/ruby/commit/83900528ad

  Log:
    Turn C4047 warning into error
    
    Warned at making precompiled header on mswin.
    
    ```
    building rb_mjit_header-2.7.0.pch
    vm.c
    d:\a\ruby\ruby\src\vm_args.c(1117): warning C4047: '=': 'const rb_callable_method_entry_t *' differs in levels of indirection from 'int'
    rb_mjit_header-2.7.0.pch updated
    ```

  Modified files:
    win32/Makefile.sub