cvs: use "apply" for patching
cvs: use "apply" for patching

cvs-1.12.13.tar.bz2 extracts to cvs-45 with the patch files found in
cvs-45/patches, so each patch file must be supplied to "apply" as
"patches/foo.diff" – the relative path within the extracted directory.

Closes #47614.

Signed-off-by: Mike McQuaid <a17fed27eaa842282862ff7c1b9c8395a26ac320@mikemcquaid.com>

filcab/homebrew,filcab/homebrew,filcab/homebrew,filcab/homebrew