* All GDB files that #include defs.h: Removed stdio.h.
(defs.h): #include stdio.h.
This has been tested by building GDBs for all targets hosted on Sun4.
None of the build problems were related to stdio.h inclusion. (n.b.
many configurations don't build for other reasons.)
* dbxread.c (read_dbx_symntab): Avoid coredump on malformed file.
* printcmd.c (print_formatted): Flush output before disassembly.
* xm-mips.h: Update KERNEL_U_ADDR for new scheme. Cleanup a bit.
Pass .reg virtual memory address to fetch_core_registers to help
it find the registers in the core-file header.
* coredep.c (fetch_core_registers): Take new argument, use it,
and pass it to register_addr to locate the block of registers.
