fixbug: config 'vs_sdkver' has no effect when generate vs project

[jinke18]

config vs_sdkver

xmake f --vs_sdkver=14.0

but it has no effect when generate a vs project

xmake project -k vs2015

this pull request fix this bug~

[waruqi]

We shouldn't have modified it that way. First of all, 14.0 should be vs_toolset not vs_sdkver.

and

xmake f --vs_toolset/vs_sdkver -> msvc toolchain/check -> find_vstudio.lua -> get real toolset/sdkver -> generator/xmake build

so we should debug and check find_vstudio.lua

xmake/xmake/toolchains/msvc/check.lua

Line 43 in 71ec32e

local vstudio = find_vstudio({vcvars_ver = vs_toolset, sdkver = vs_sdkver})

xmake/xmake/modules/detect/sdks/find_vstudio.lua

Line 125 in 71ec32e

file:print("call \"%s\" -host_arch=%s -arch=%s -winsdk=%s -vcvars_ver=%s > nul", vcvarsall, host_arch, arch, opt.sdkver and opt.sdkver or "", opt.vcvars_ver)

[jinke18]

I'm sorry I made a mistake when submitting the pull request message.

it should be
config vs_sdkver

xmake f --vs_sdkver=8.1

[waruqi]

you still need debug find_vstudio.lua, if it works, vcvars.WindowsSDKVersion will be changed to your configs after running xmake f --vs_sdkver=xxx

[waruqi]

You can open an issue for this patch. I will look at it.