oj: Version 3.13.0 can't be installed on Windows ('gettimeofday' conflicting types)

The issue described in #94 is back with 3.13.0 - probably, because a new parser has been introduced. I’m observing this on Windows 10x64 with Ruby 2.7 and 3.0 (and the latest mingw toolchain):

make DESTDIR\=
generating oj-x64-mingw32.def
compiling cache.c
compiling cache8.c
compiling circarray.c
compiling code.c
compiling compat.c
compiling custom.c
compiling debug.c
compiling dump.c
compiling dump_compat.c
compiling dump_leaf.c
compiling dump_object.c
compiling dump_strict.c
compiling err.c
compiling fast.c
fast.c: In function 'parse_json':
fast.c:776:20: warning: array subscript -16384 is outside array bounds of 'struct _parseInfo[1]' [-Warray-bounds]
  776 |     pi.stack_min = (void *)((char *)&pi - (512 * 1024));
      |                    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
fast.c:752:23: note: while referencing 'pi'
  752 |     struct _parseInfo pi;
      |                       ^~
compiling hash_test.c
compiling intern.c
compiling mimic_json.c
compiling object.c
compiling odd.c
compiling oj.c
compiling parse.c
compiling parser.c
In file included from parser.c:18:
C:/Ruby30-x64/msys64/mingw64/x86_64-w64-mingw32/include/sys/time.h:42:13: error: conflicting types for 'gettimeofday'
   42 | int __cdecl gettimeofday(struct timeval *__restrict__,
      |             ^~~~~~~~~~~~
In file included from C:/Ruby30-x64/include/ruby-3.0.0/ruby/internal/dosish.h:38,
                 from C:/Ruby30-x64/include/ruby-3.0.0/ruby/defines.h:79,
                 from C:/Ruby30-x64/include/ruby-3.0.0/ruby/ruby.h:23,
                 from C:/Ruby30-x64/include/ruby-3.0.0/ruby.h:38,
                 from parser.h:8,
                 from parser.c:3:
C:/Ruby30-x64/include/ruby-3.0.0/ruby/win32.h:304:12: note: previous declaration of 'gettimeofday' was here
  304 | extern int gettimeofday(struct timeval *, struct timezone *);
      |            ^~~~~~~~~~~~
make: *** [Makefile:245: parser.o] Error 1

make failed, exit code 2