[tnozaki-gdtoa] upgrade libc's gdtoa

[Takehiko NOZAKI]

T/O

[Takehiko NOZAKI]

• Issue #199 - arithchk.c - rename IEEE_8087/IEEE_MC68k -> IEEE_LITTLE_ENDIAN/IEEE_BIG_ENDIAN
• Issue #200 - shutup compiler warning and lint(1) command insertion
• Issue #201 - INF/NAN check on VAX missing
• Issue #202 - unused goto label warning without -DHonor_FLT_ROUNDS
• Issue #203 - overriding ACQUIRE_DTOA_LOCK/FREE_DTOA_LOCK macro
• Issue #204 - dotoa -> __dtoa symbol renaming to avoid conflict libc's gdtoa and user libgdtoa
• Issue #205 - define U?Long type as stdint's u?intN_t
• Issue #206 - enable locale, use LC_NUMERIC's decimal point

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