New comment by dmarto on void-packages repository

https://github.com/void-linux/void-packages/pull/39688#issuecomment-1266927505

Comment:
Ok, I tried my best, this is what I figured:
 - we want to keep the old rules file, for people that have it
 - the new one should NOT overwrite it
 
```diff
diff --git a/srcpkgs/libfido2/template b/srcpkgs/libfido2/template
index a5127f2ea6..7472dc44ab 100644
--- a/srcpkgs/libfido2/template
+++ b/srcpkgs/libfido2/template
@@ -14,14 +14,16 @@ changelog="https://raw.githubusercontent.com/Yubico/libfido2/main/NEWS"
 distfiles="https://github.com/Yubico/libfido2/archive/${version}.tar.gz"
 checksum=813d6d25116143d16d2e96791718a74825da16b774a8d093d96f06ae1730d9c5
 # udev rules used to be shipped by libu2f-host
-conf_files="/usr/lib/udev/rules.d/70-u2f.rules"
 conflicts="libu2f-host<=1.1.10_3"
+# keep the old 70-u2f.rules
+preserve=yes
 
 post_extract() {
 	vsed -i -e '/add_compile_options(-Werror)/d' CMakeLists.txt
 }
 
 post_install() {
+	mv ${DESTDIR}/usr/lib/udev/rules.d/{70-u2f.rules,69-u2f-plugdev.rules}
 	vlicense LICENSE
 }
```
I am not sure if this is a good solution or not; I would love any help or suggestions you may have.