Update macOS build scripts

"sleep 10" didn't work, let's try sync ...

Author: rodlie

src/scripts/build_mac.sh

@@ -84,5 +84,6 @@ rm -f src/app/Friction.app/Contents/Frameworks/{libQt5MultimediaWidgets.5.dylib,
 rm -rf src/app/Friction.app/Contents/PlugIns/{bearer,iconengines,imageformats,mediaservice,printsupport,styles}
 
 mkdir dmg && mv src/app/Friction.app dmg/
-sleep 10
+
+sync
 hdiutil create -volname "Friction" -srcfolder dmg -ov -format ULMO Friction-${VERSION}-${CPU}.dmg

src/scripts/build_mac_universal.sh

@@ -66,5 +66,6 @@ plutil -insert LSArchitecturePriority.0 -string arm64 ${PLIST}
 plutil -insert LSArchitecturePriority.1 -string x86_64 ${PLIST}
 
 mkdir dmg && mv Friction.app dmg/
-sleep 10
+
+sync
 hdiutil create -volname "Friction" -srcfolder dmg -ov -format ULMO Friction-${VERSION}.dmg