fix build with llvm-dlltool

[neheb]

It doesn't support the full versions of these options.

[m417z]

From what I see, llvm-dlltool supports --dllname and --output-lib, but not --def (--input-def can be used instead):
https://github.com/llvm/llvm-project/blob/99d3ead44cfb21dca24c63a0b0731eaad54b491e/llvm/lib/ToolDrivers/llvm-dlltool/Options.td#L6-L13

I see that GNU binutils also supports --input-def, and --def only exists for compatibility:
https://github.com/haiku/buildtools/blob/57c9179de2ca2850f82c28d34123b933ee24368e/binutils/binutils/dlltool.c#L3737

So if you change your PR to replace --def with --input-def, I'll merge it.

[neheb]

That link says -d is the same as input-def

edit: the second one that is.

[m417z]

Yes, your change looks correct, but I see no reason to change to the short options. Replacing --def with --input-def would be a smaller change which still fixes the incompatibility with llvm-dlltool.