configure: replaced option '--with-nls' by autoconf's '--localedir'

Autoconf have been providing the option '--localedir' for a long time now,
so this patch removes the deprecated '--with-nls' option and makes use of
the standard '--localedir' instead.

Took opportunity to define the path in the 'config-paths.h' in the same way
the other paths are defined to be consistent, which also simplify the
compilation commands.

Signed-off-by: Christophe CURIS <christophe.curis@free.fr>

WPrefs.app/Makefile.am

@@ -47,7 +47,7 @@ WPrefs_SOURCES = \
 
 AM_CFLAGS =
 
-AM_CPPFLAGS = -DLOCALEDIR=\"$(NLSDIR)\" -DRESOURCE_PATH=\"$(wpdatadir)\" -DWMAKER_RESOURCE_PATH=\"$(pkgdatadir)\" \
+AM_CPPFLAGS = -DRESOURCE_PATH=\"$(wpdatadir)\" -DWMAKER_RESOURCE_PATH=\"$(pkgdatadir)\" \
 	 -I$(top_srcdir)/wrlib -I$(top_srcdir)/WINGs @HEADER_SEARCH_PATH@ 
 
 WPrefs_DEPENDENCIES = $(top_builddir)/WINGs/libWINGs.la

WPrefs.app/po/Makefile.am

@@ -2,8 +2,6 @@ DOMAIN = WPrefs
 
 CATALOGS = @WPREFSMOFILES@
 
-nlsdir = $(NLSDIR)
-
 CLEANFILES = $(DOMAIN).pot $(CATALOGS)
 
 EXTRA_DIST = bg.po ca.po cs.po de.po es.po et.po fi.po fr.po hr.po hu.po \
@@ -59,12 +57,12 @@ endif
 
 
 install-data-local:  $(CATALOGS)
-	$(mkinstalldirs) $(DESTDIR)$(nlsdir)
+	$(mkinstalldirs) $(DESTDIR)$(localedir)
 	for n in $(CATALOGS) __DuMmY ; do \
 		if test "$$n" -a "$$n" != "__DuMmY" ; then \
 			l=`basename $$n .mo`; \
-			$(mkinstalldirs) $(DESTDIR)$(nlsdir)/$$l/LC_MESSAGES; \
-			$(INSTALL_DATA) -m 644 $$n $(DESTDIR)$(nlsdir)/$$l/LC_MESSAGES/$(DOMAIN).mo; \
+			$(mkinstalldirs) $(DESTDIR)$(localedir)/$$l/LC_MESSAGES; \
+			$(INSTALL_DATA) -m 644 $$n $(DESTDIR)$(localedir)/$$l/LC_MESSAGES/$(DOMAIN).mo; \
 		fi; \
 	done