MSVC failed to build C++ mrbgems.

[dyama]

Build.enable_cxx_abi method in 'mruby_build.rake' set cxx.command value into linker.command.
In case of my MSVC, cxx.command is 'cl.exe' and linker.command is 'link.exe'. When after the method, cl.exe in linker.command does not receive the options for linker and it crashed.

I tried comment out 'linker.command = cxx.command' line, it's running well.

I don't understand about ABI well, so I cannot fix it myself, and I have no good idea.

NOTE: My MSVC is v9(too old?). The C++ mrbgem has no problem in my linux with g++.

Thanks.

[take-cheeze]

Ah, sorry I didn't think about MSVC.
Does this patch work?

[dyama]

Thanks for your patch.
The rake is working fine!

[take-cheeze]

@dyama Thanks for testing. Should be merged as #2589.