po: cleaner extension handling in xgettext wrapper

po/Makevars.in

@@ -12,8 +12,8 @@ XGETTEXT_FALLBACK := $(XGETTEXT)
 
 # Override xgettext with a LuaJIT aware variant (which calls
 # into plain xgettext if it needs to, and handles Lua on its own)
-XGETTEXT = ELUA="@elua_bin@" ELUA_INTREE="$(top_srcdir)/src/bin/elua/elua" \
-	XGETTEXT="$(XGETTEXT_FALLBACK)" ELUA_EXT="@EXEEXT@" \
+XGETTEXT = ELUA_INTREE="$(top_srcdir)/src/bin/elua/elua@EXEEXT@" \
+	ELUA="@elua_bin@" XGETTEXT="$(XGETTEXT_FALLBACK)" \
 	$(top_srcdir)/po/xgettext_wrapper.sh
 
 # These options get passed to xgettext.

po/xgettext_wrapper.sh

@@ -3,7 +3,7 @@
 ELUA_BIN="$ELUA"
 
 if [ ! "$ELUA_BIN" ]; then
-    ELUA_BIN="${ELUA_INTREE}${ELUA_EXT}"
+    ELUA_BIN="${ELUA_INTREE}"
     export EFL_RUN_IN_TREE=1
 fi