tdf#42949 Fix IWYU warnings in i18nlangtag/

Found with bin/find-unneeded-includes
Only removal proposals are dealt with here.

Change-Id: I8a40dc89e121bd121c1f90f5636eee65636cad17
Reviewed-on: https://gerrit.libreoffice.org/72014
Tested-by: Jenkins
Reviewed-by: Miklos Vajna <vmiklos@collabora.com>

i18nlangtag/IwyuFilter_i18nlangtag.yaml

+---
+assumeFilename: i18nlangtag/source/isolang/isolang.cxx

i18nlangtag/qa/cppunit/test_languagetag.cxx

@@ -18,9 +18,6 @@
 #include <i18nlangtag/languagetag.hxx>
 
 #include <rtl/ustring.hxx>
-#include <rtl/ustrbuf.hxx>
-#include <sal/log.hxx>
-#include <osl/file.hxx>
 
 #include <com/sun/star/lang/Locale.hpp>
 #include <com/sun/star/i18n/ScriptType.hpp>

i18nlangtag/source/isolang/inunx.cxx

@@ -18,20 +18,19 @@
  */
 
 #include <stdlib.h>
-#include <stdio.h>
 
 #ifdef MACOSX
 #include <osl/process.h>
 #include <rtl/locale.h>
 #include <rtl/ustring.hxx>
+#include <i18nlangtag/languagetag.hxx>
 
 #else   // MACOSX
 #include <rtl/string.hxx>
 #endif  // MACOSX
 
 #include <osl/mutex.hxx>
-#include <rtl/instance.hxx>
-#include <i18nlangtag/languagetag.hxx>
+#include <osl/doublecheckedlocking.h>
 #include <i18nlangtag/mslangid.hxx>
 
 

i18nlangtag/source/isolang/inwnt.cxx

@@ -24,7 +24,7 @@
 #include <winbase.h>
 #include <winnls.h>
 #include <osl/mutex.hxx>
-#include <rtl/instance.hxx>
+#include <osl/doublecheckedlocking.h>
 #include <i18nlangtag/mslangid.hxx>
 
 static LanguageType nImplSystemLanguage = LANGUAGE_DONTKNOW;

i18nlangtag/source/isolang/isolang.cxx

@@ -19,8 +19,6 @@
 
 #include <rtl/ustring.hxx>
 #include <rtl/string.hxx>
-#include <rtl/ustrbuf.hxx>
-#include <rtl/strbuf.hxx>
 
 #include <i18nlangtag/mslangid.hxx>
 #include <i18nlangtag/languagetag.hxx>

i18nlangtag/source/isolang/mslangid.cxx

@@ -19,7 +19,6 @@
 
 #include <sal/config.h>
 #include <rtl/ustring.hxx>
-#include <rtl/string.hxx>
 #include <com/sun/star/i18n/ScriptType.hpp>
 
 #include <i18nlangtag/mslangid.hxx>