Update baseline to resolve file conflicts with nanovg and stb

[JackBoosY]

port stb and nanovg have file conflicts:

2020-01-04T12:18:04.9047756Z The following files are already installed in C:/vsts/_work/3/s/installed/x86-windows and are in conflict with stb:x86-windows
2020-01-04T12:18:04.9049652Z 
2020-01-04T12:18:04.9051732Z Installed by nanovg:x86-windows
2020-01-04T12:18:04.9053626Z     include/stb_image.h

So far the pipeline has only reported x86-windows conflicts and less than 10 ports depend on stb, so only stb:x86-windows=ignore is added.

Related: #9552 #9550.

[cenit]

isn't it better to remove stb header from nanovg and add a dependency on it?

[cenit]

it has been fixed in master thanks to #8813 merge, I think this PR is no longer necessary