* amd64-windows-nat.c Rename gdb-specific win32_* to windows_* throughout.

* amd64-windows-nat.c Rename gdb-specific win32_* to windows_* throughout.
* i386-cygwin-tdep.c: Ditto.
* i386-windows-nat.c: Ditto.
* windows-nat.h: Ditto.
* windows-tdep.c: Ditto.
* windows-tdep.h: Ditto.
* windows-nat.c: Ditto.
(cygwin_load_start): Redefine as CORE_ADDR.
(cygwin_load_end): Ditto.
(windows_make_so): Coerce result of address arithmetic to to uintptr_t before
coercing to CORE_ADDR to avoid a compiler warning.
(handle_exception): Define addr as CORE_ADDR and coerce ExceptionAddress to
uintptr_t before assigining to avoid a compiler warning.
* config/djgpp/fnchange.lst: Add mappings for recently renamed windows files.