avoid flex-caused warnings about unused functions

Change-Id: If6a028efbf2403fd92dcab914ae3197d34579392
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/87869
Tested-by: Jenkins
Reviewed-by: Luboš Luňák <l.lunak@collabora.com>

l10ntools/source/cfglex.l

@@ -55,6 +55,7 @@ static int bText=0;
 %}
 
 %option yylineno
+%option nounput
 %option never-interactive
 
 %p 24000

l10ntools/source/xrmlex.l

@@ -51,6 +51,7 @@ static int bText=0;
 %}
 
 %option yylineno
+%option nounput
 %option never-interactive
 
 %p 24000

unoidl/source/sourceprovider-scanner.l

@@ -13,6 +13,8 @@
 %option never-interactive
 %option nounistd
 %option noyywrap
+%option noinput
+%option nounput
 %option reentrant
 %option warn
 %option yylineno