grub2: disable 'check-macro-version' build rule in 'po' build

This seems to occur when gettext-full is built on the host-side
and the autoreconf stuff re-generates some of the build files,
except for the po/Makefile.in.in

Signed-off-by: Alexandru Ardelean <ardeleanalex@gmail.com>

package/boot/grub2/patches/101-disable-gettext-check-macro-version.patch

@@ -0,0 +1,13 @@
+diff --git a/po/Makefile.in.in b/po/Makefile.in.in
+index 3619458..060e0db 100644
+--- a/po/Makefile.in.in
++++ b/po/Makefile.in.in
+@@ -97,7 +97,7 @@ CATALOGS = @CATALOGS@
+ 	mv t-$@ $@
+ 
+ 
+-all: check-macro-version all-@USE_NLS@
++all: all-@USE_NLS@
+ 
+ all-yes: stamp-po
+ all-no: