package/systemd: needs any UTF-8 locale

Not all distributions have the language-agnostic C.UTF-8 locale (Gentoo,
I'm frowning at you!).

Instead, use any UTF-8 locale provided by the system.

Reported-by: Christian Stewart <kidovate@gmail.com>
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Maxime Hadjinlian <maxime.hadjinlian@gmail.com>
Cc: Julius Kriukas <julius@kriukas.lt>
Cc: Christian Stewart <kidovate@gmail.com>
Cc: Trent Piepho <tpiepho@impinj.com>
Cc: Adam Duskett <aduskett@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/systemd/Config.in

@@ -27,7 +27,7 @@ menuconfig BR2_PACKAGE_SYSTEMD
 	select BR2_PACKAGE_BUSYBOX_SHOW_OTHERS # kmod-tools
 	select BR2_PACKAGE_KMOD_TOOLS
 	select BR2_TARGET_TZ_INFO
-	select BR2_NEEDS_HOST_C_UTF8_LOCALE
+	select BR2_NEEDS_HOST_UTF8_LOCALE
 	help
 	  systemd is a system and service manager for Linux,
 	  compatible with SysV and LSB init scripts. systemd provides

package/systemd/systemd.mk

@@ -387,7 +387,7 @@ endef
 
 SYSTEMD_NINJA_OPTS = $(if $(VERBOSE),-v) -j$(PARALLEL_JOBS)
 
-SYSTEMD_ENV = $(TARGET_MAKE_ENV) LANG=C.UTF-8 LC_ALL=C.UTF-8
+SYSTEMD_ENV = $(TARGET_MAKE_ENV) $(HOST_UTF8_LOCALE_ENV)
 
 define SYSTEMD_CONFIGURE_CMDS
 	rm -rf $(@D)/build