Link threads support to the build

gnu/usr.bin/gdb/arch/mips/Makefile

@@ -1,7 +1,7 @@
 # $FreeBSD$
 
 .if !defined(GDB_CROSS_DEBUGGER)
-LIBSRCS+= mipsfbsd-nat.c
+LIBSRCS+= mipsfbsd-nat.c fbsd-threads.c
 .endif
 LIBSRCS+= solib.c solib-svr4.c
 LIBSRCS+= mips-tdep.c mipsfbsd-tdep.c fbsd-proc.c

gnu/usr.bin/gdb/arch/mips/init.c

@@ -131,6 +131,7 @@ initialize_all_files (void)
   _initialize_infptrace ();
   _initialize_inftarg ();
   _initialize_solib ();
+  _initialize_thread_db ();
   _initialize_svr4_solib ();
 #if 0
   _initialize_svr4_lm ();