[Xtensa] Change to 16-bit wide characters for xtensa-elf target

[Bob Wilson]

The xtensa-elf target should use 16-bit wide characters but until now has been 
using 32 bits.  The xtensa-linux-gnu target still uses 32-bit wide characters 
and I patched xtensa/linux.h to set this explicitly.  This patch also removes 
several redundant macros and clarifies some comments.  Tested with the 
xtensa-elf target and committed on the mainline branch.

2003-04-29  Bob Wilson  <bob.wilson@acm.org>

        * config/xtensa/elf.h (SIZE_TYPE, PTRDIFF_TYPE, USER_LABEL_PREFIX): 
        Remove redundant macros.
        (WCHAR_TYPE, WCHAR_TYPE_SIZE): Change to "short unsigned int".
        (LOCAL_LABEL_PREFIX): Define unconditionally.
        (NO_DOT_IN_LABEL): Clarify comment.
        * config/xtensa/linux.h (WCHAR_TYPE, WCHAR_TYPE_SIZE): Add explicit 
        definition to "long int".

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