CI: remove WINE_SDK_PATH from llvm winxx builds

It doesn't seem to be used in the CI file or the Docker.
15 jobs for !21 with llvm-tools/1 in 42 minutes and 35 seconds (queued for 3 seconds)
latest detached
Status Job ID Name Coverage
  Build
canceled #408814
amd64 docker
android-arm

canceled #408815
amd64 docker
android-arm64

canceled #408816
amd64 docker
android-x86

canceled #408817
amd64 docker
android-x86_64

canceled #408808
amd64 docker
debian

canceled #408812
macos
ios-arm64

00:00:10

canceled #408813
macos
ios-armv7

00:00:09

canceled #408811
macos
macos

00:00:09

canceled #408810
amd64 docker
raspbian-arm

canceled #408809
amd64 docker
snap

canceled #408807
amd64 docker
uwp64-libvlc-llvm

canceled #408803
amd64 docker
win32

passed #408805
amd64 docker
win32-llvm

00:40:20

canceled #408804
amd64 docker
win64

passed #408806
amd64 docker
win64-llvm

00:42:11