mruby/mruby — pull request #2176 by cremno (2014-05-02 20:05:17+00:00)
Title: MSVC: treat implicit function decl. as error

As equivalent to GCC's [-Werror-implicit-function-declaration](https://github.com/mruby/mruby/blob/6ff1b63b0d8a8e3fc755bfc0a5256a0c52703075/tasks/toolchains/gcc.rake#L4).