Use a separate domain for translating gnulib

Use the --po-domain option to gnulib-tool to create a new textdomain
that can be used by gnulib files for translations. This way, we don't
have to maintain the list of all files that require translations in
gnulib.

* bootstrap.conf: Use --po-domain and --po-base options to create a
  separate base for gnulib translations
* src/main.c(i18n_initialize): Call bindtextdomain on wget-gnulib to
  include those translations as well
* Makefile.am: Add new directory gnulib_po to SUBDIRS
* configure.ac: Generate gnulib_po/Makefile.in
* lib/Makefile.am: Set AM_CPPFLAGS to empty since gnulib.mk expects it
  to be set

Makefile.am

@@ -40,7 +40,7 @@ distuninstallcheck_listfiles = find . -type f | \
 ACLOCAL_AMFLAGS = -I m4
 
 # subdirectories in the distribution
-SUBDIRS = lib src doc po util fuzz tests testenv
+SUBDIRS = lib src doc po gnulib_po util fuzz tests testenv
 
 EXTRA_DIST = MAILING-LIST \
              msdos/config.h msdos/Makefile.DJ \

bootstrap.conf

@@ -20,7 +20,7 @@
 source_base=lib
 tests_base=lib/tests
 gnulib_name=libgnu
-gnulib_tool_option_extras="--makefile-name=gnulib.mk"
+gnulib_tool_option_extras="--makefile-name=gnulib.mk --po-base=gnulib_po --po-domain=wget"
 use_libtool=0
 checkout_only_file=
 

configure.ac

@@ -996,8 +996,8 @@ dnl
 dnl Create output
 dnl
 AC_CONFIG_FILES([Makefile src/Makefile doc/Makefile util/Makefile
-                 po/Makefile.in tests/Makefile fuzz/Makefile
-                 lib/Makefile testenv/Makefile
+                 po/Makefile.in gnulib_po/Makefile.in tests/Makefile
+                 fuzz/Makefile lib/Makefile testenv/Makefile
                  tests/certs/interca.conf tests/certs/rootca.conf])
 AC_CONFIG_HEADERS([src/config.h])
 AC_OUTPUT

lib/Makefile.am

@@ -9,5 +9,6 @@ noinst_LIBRARIES =
 MAINTAINERCLEANFILES =
 
 AM_CFLAGS = $(GNULIB_WARN_CFLAGS) $(WERROR_CFLAGS)
+AM_CPPFLAGS =
 
 include gnulib.mk

src/main.c

@@ -153,6 +153,7 @@ i18n_initialize (void)
   setlocale (LC_ALL, "");
   /* Set the text message domain.  */
   bindtextdomain ("wget", LOCALEDIR);
+  bindtextdomain ("wget-gnulib", LOCALEDIR);
   textdomain ("wget");
 #elif defined WINDOWS
   char MBCP[16] = "";