build-sys: add NLS support

Add GNU gettext internationalization and localization support.

Signed-off-by: Sami Kerola <kerolasa@iki.fi>

.gitignore

@@ -1,3 +1,9 @@
+*.lo
+*.o
+*.so
+.deps
+.libs
+ABOUT-NLS
 aclocal.m4
 autom4te.cache
 compile
@@ -5,24 +11,22 @@ config.guess
 config.h
 config.h.in
 config.log
+config.rpath
 config.status
 config.sub
 configure
 depcomp
-.deps
-.libs
 free
 INSTALL
 install-sh
 kill
 libtool
-*.lo
 ltmain.sh
 m4/
 Makefile
 Makefile.in
 missing
-*.o
+mkinstalldirs
 pgrep
 pkill
 pmap
@@ -39,7 +43,6 @@ pwdx
 skill
 slabtop
 snice
-*.so
 stamp-h1
 sysctl
 tload