Fix the SVM Windows Artifact

[YaronWittenstein]

@sudachen has pointed out that the current SVM Windows Artifact is corrupted and he suggested two ways to tackle it:

• Use dlltool @sudachen - can you please elaborate what commands need to be used here?

• Use the x86_64-pc-windows-gnu toolchain explicitly when compiling to Windows. @sudachen - is anything missing here?

@neysofu @moshababo @noamnelke FYI

[sudachen]

There are the two different way. You can choose one of them. When you use *-windows-gnu toolchain it creates lib*.dll.a file automagically. However, if you need/want by some reason use VS runtime/backend you can create lib.a file in DWARF fromat required by golang compiler with dlltool, instead COFF .lib created by VS toolchain.

[sudachen]

gendef.exe svm.dll
dlltool.exe -d svm.def -D svm.dll -l libsvm.a

[YaronWittenstein]

Thank you!