Fix some warnings

--HG--
branch : develop

code/nel/src/misc/config_file/cf_bison.simple

@@ -328,7 +328,7 @@ yynewstate:
 #endif
 
       /* Get the current used size of the three stacks, in elements.  */
-      int size = yyssp - yyss + 1;
+      int size = (int)(yyssp - yyss + 1);
 
 #ifdef yyoverflow
       /* Each stack pointer address is followed by the size of

code/nel/src/misc/config_file/cf_flex.skl

@@ -1000,7 +1000,7 @@ int yyFlexLexer::yyinput()
 
 		else
 			{ /* need more input */
-			int offset = yy_c_buf_p - yytext_ptr;
+			int offset = (int)(yy_c_buf_p - yytext_ptr);
 			++yy_c_buf_p;
 
 			switch ( yy_get_next_buffer() )

code/nel/src/misc/config_file/cf_lexical.cpp

@@ -2773,7 +2773,7 @@ static int input()
 
 		else
 			{ /* need more input */
-			int offset = yy_c_buf_p - yytext_ptr;
+			int offset = (int)(yy_c_buf_p - yytext_ptr);
 			++yy_c_buf_p;
 
 			switch ( yy_get_next_buffer() )