Always use CurlDownloadStrategy for legacy patches

Fixes #27671.
Remove redundant method

This already happens in the superclass.
cogl: use patch DSL
collada-dom: use patch DSL
colordiff: use patch DSL
colorsvn: use patch DSL
cppdom: use patch DSL
cppunit: use patch DSL
crosstool-ng: use patch DSL
cscope: use patch DSL
csync: use patch DSL
ctags: use patch DSL
cups-pdf: use patch DSL
dcmtk: use patch DSL
devil: use patch DSL
devtodo: use patch DSL
disco: use patch DSL
djmount: use patch DSL
djview4: use patch DSL
doxygen: use patch DSL