libc/glibc: workaround for autoconf'ed define of caddr_t

When building canadian cross compiler, I have some trouble with
configure defining caddr_t as a macro, like:
#define caddr_t char *

When combined with the types.h where caddr_t is protected together
with daddr_t, the typedef of caddr_t breaks.

This patch works around it by protecting the caddr_t typedef
specifically.

I am uncertain as to the real cause and solution to this :-(

Signed-off-by: Esben Haabendal <eha@dev.doredevelopment.dk>

 --- glibc-2_9.orig/nptl/init.c	2007-10-15 22:25:25.000000000 +0200

 +++ glibc-2_9/nptl/init.c	2010-08-18 10:46:06.109098646 +0200

 @@ -236,7 +236,7 @@

  /* This can be set by the debugger before initialization is complete.  */

 -static bool __nptl_initial_report_events;

 +static bool __nptl_initial_report_events __attribute_used__;

  void

  __pthread_initialize_minimal_internal (void)