Let dtc build with FreeBSD yacc/lex.

Sponsored by:	The FreeBSD Foundation

contrib/dtc/dtc-lexer.l

@@ -38,6 +38,8 @@ LINECOMMENT	"//".*\n
 #include "srcpos.h"
 #include "dtc-parser.tab.h"
 
+YYLTYPE yylloc;
+
 #define	YY_USER_ACTION \
 	{ \
 		yylloc.file = srcpos_file; \

contrib/dtc/dtc-parser.y

@@ -18,7 +18,6 @@
  *                                                                   USA
  */
 
-%locations
 
 %{
 #include <stdio.h>
@@ -26,6 +25,8 @@
 #include "dtc.h"
 #include "srcpos.h"
 
+YYLTYPE yylloc;
+
 extern int yylex(void);
 extern void yyerror(char const *s);