Fix compile error with gcc 9: use of [[unlikely]]#392
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gcc 9 (and only 9) advertises availability of
[[unlikely]]but then fails to compile it. Fixed by selectively disabling on gcc 9. With this change, now fast_float compiles in all existing gcc and clang versions.Also, removed the value of 1 from
#define FAST_FLOAT_USE_UNLIKELY_ATTR 1, to avoid erroneous hint to subsequent use of#ifinstead of#ifdef.