gnu: eudev: Build with udevrulesdir pointing to /etc/udev/rules.d.

Prior to this change, only the udev rules installed to eudev's prefix were
consulted by tools such as udevadm, leading to problems such as when
configuring network interfaces, or attempting to override its default rules.

While our custom eudev patch adding support for the EUDEV_RULES_DIRECTORY
environment variable could have been refined to take precedence over the
package's configured udevrulesdir, this was not pursued for the following
reasons:

1. Due to eudev's using inotify to detect new rules, the EUDEV_RULES_DIRECTORY
is fixed in Guix System, per commit e9fa17eb98 ("services: udev: Use a fixed
location for the rules directory and config.")

2. Users would have had to set EUDEV_RULES_DIRECTORY to the fixed directory
themselves to have udevadm work as expected, which is inconvenient.

3. This simple solution is already implemented and tested in NixPkgs.

* gnu/packages/linux.scm (eudev) [source]: Remove custom patch.
[arguments] <#:make-flags>: New argument.
<#:phases>: Override install phase to alter installation make flags.
* gnu/services/base.scm (udev-shepherd-service): Do not set
EUDEV_RULES_DIRECTORY environment variable.
* gnu/packages/patches/eudev-rules-directory.patch: Delete file.
* gnu/local.mk (dist_patch_DATA): De-register it.

Fixes: https://issues.guix.gnu.org/63508
Reported-by: Felix Lechner <felix.lechner@lease-up.com>
Change-Id: Ib8698f4b452f6fd0951bcd71831705b1be85e6e0

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