Fix the build on Windows when using rust-skia's Skia binaries

[tronical]

The build on Windows with Visual Studio and using rust-skia's Skia binaries may produce the following error:

= note: skunicode.lib(icu.SkLoadICU.obj) : error LNK2019: unresolved external symbol __std_init_once_link_alternate_names_and_abort referenced in function "bool __cdecl SkLoadICU(void)" (?SkLoadICU@@YA_NXZ)
          skunicode.lib(icu.umutex.obj) : error LNK2001: unresolved external symbol __std_init_once_link_alternate_names_and_abort
          D:\a\slint\slint\target\debug\deps\plotter.exe : fatal error LNK1120: 1 unresolved externals

A newer version of Visual Studio might fix this (>= 17.2?). But those who do want or cannot upgrade, it might make sense to offer a way to build Skia from source.