Work around -Werror,-Wkeyword-macro

...where liblangtag/lt-macros.h does #undef inline because LT_HAVE_INLINE is not
defined---liblangtag has a config.h (that would define it), but for whatever
reason does not include it...

Change-Id: I6a6f0a3522b7aef12573af7d7c4c00bb0f1368eb

i18nlangtag/source/languagetag/languagetag.cxx

@@ -24,6 +24,7 @@
 //#define erDEBUG
 
 #if defined(ENABLE_LIBLANGTAG)
+#define LT_HAVE_INLINE
 #include <liblangtag/langtag.h>
 #else
 /* Replacement code for LGPL phobic and Android systems.