Update Windows builder, use libmpeg2 mirror

Author: FrodeSolheim

.github/workflows/Windows_x86-64.yml

@@ -15,7 +15,7 @@ on:
 
 jobs:
   Windows_x86-64:
-    runs-on: windows-2019
+    runs-on: windows-2022
 
     env:
       DISCORD_WEBHOOK_URL: ${{ secrets.DISCORD_WEBHOOK_URL }}

build/env/packages/libmpeg2

@@ -9,7 +9,7 @@ REVISION=0
 . build/env/scripts/package.sh
 
 build/env/scripts/download.py \
-https://libmpeg2.sourceforge.io/files/$PACKAGE.tar.gz \
+https://fs-uae.net/files/libmpeg2-0.5.1.tar.gz \
 sha256:$CHECKSUM
 
 rm -Rf build/env/_temp && mkdir build/env/_temp && cd build/env/_temp