package/ushare: fix build without msgfmt

Fix the following build failure without /usr/bin/msgfmt raised since the
addition of ushare in commit 74097fd659:

make[3]: Entering directory `/home/buildroot/autobuild/run/instance-3/output-1/build/ushare-2.1/po'
/usr/bin/msgfmt -c --statistics -o fr.gmo fr.po
make[3]: /usr/bin/msgfmt: Command not found

To fix this build failure, set GMSGFMT to $(HOST_DIR)/bin/msgfmt and
don't build po files if NLS is disabled

Fixes:
 - http://autobuild.buildroot.org/results/9f6b5b8f38386135bacd2d8f6e97c1fea77bbe69

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
(cherry picked from commit c4e1a07510)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/ushare/0001-Don-t-build-po-files-if-NLS-is-disabled.patch

@@ -0,0 +1,47 @@
+From 977171781f5d49e61b46c0241fb67cbb7d666498 Mon Sep 17 00:00:00 2001
+From: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+Date: Sun, 22 Aug 2021 10:44:48 +0200
+Subject: [PATCH] Don't build po files if NLS is disabled
+
+Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+[Upstream status: https://github.com/ddugovic/uShare/pull/12]
+---
+ Makefile  | 7 +++++--
+ configure | 1 +
+ 2 files changed, 6 insertions(+), 2 deletions(-)
+
+diff --git a/Makefile b/Makefile
+index ebd8f91..6686cfd 100644
+--- a/Makefile
++++ b/Makefile
+@@ -14,10 +14,13 @@ EXTRADIST = AUTHORS \
+ 	    THANKS \
+ 	    TODO \
+ 
+-SUBDIRS = po \
+-	  scripts \
++SUBDIRS = scripts \
+ 	  src \
+ 
++ifeq ($(NLS),yes)
++SUBDIRS += po
++endif
++
+ all:
+ 	for subdir in $(SUBDIRS); do \
+ 	  $(MAKE) -C $$subdir $@; \
+diff --git a/configure b/configure
+index 4a3efe0..162a776 100755
+--- a/configure
++++ b/configure
+@@ -723,6 +723,7 @@ append_config "LDFLAGS=$LDFLAGS"
+ append_config "INSTALL=$INSTALL"
+ 
+ append_config "DEBUG=$debug"
++append_config "NLS=$nls"
+ 
+ 
+ echolog "Creating $CONFIG_H ..."
+-- 
+2.32.0
+

package/ushare/ushare.mk

@@ -18,7 +18,12 @@ USHARE_CONF_OPTS = \
 	--sysconfdir=/etc \
 	--disable-strip
 
-ifeq ($(BR2_SYSTEM_ENABLE_NLS),)
+USHARE_MAKE_OPTS = LDFLAGS="$(TARGET_LDFLAGS) $(USHARE_LDFLAGS)"
+
+ifeq ($(BR2_SYSTEM_ENABLE_NLS),y)
+USHARE_CONF_OPTS += --enable-nls
+USHARE_MAKE_OPTS += GMSGFMT="$(HOST_DIR)/bin/msgfmt"
+else
 USHARE_CONF_OPTS += --disable-nls
 endif
 
@@ -31,7 +36,7 @@ define USHARE_CONFIGURE_CMDS
 endef
 
 define USHARE_BUILD_CMDS
-	$(TARGET_MAKE_ENV) $(MAKE) LDFLAGS="$(TARGET_LDFLAGS) $(USHARE_LDFLAGS)" -C $(@D)
+	$(TARGET_MAKE_ENV) $(MAKE) $(USHARE_MAKE_OPTS) -C $(@D)
 endef
 
 define USHARE_INSTALL_TARGET_CMDS