libstdc++: std::stoi etc. do not need C99 <stdlib.h> support [PR110653]

std::stoi, std::stol, std::stoul, and std::stod only depend on C89
functions, so don't need to be guarded by _GLIBCXX_USE_C99_STDLIB

std::stoll and std::stoull don't need C99 strtoll and strtoull if
sizeof(long) == sizeof(long long).

std::stold doesn't need C99 strtold if DBL_MANT_DIG == LDBL_MANT_DIG.

This only applies to the narrow character overloads, the wchar_t
overloads depend on a separate _GLIBCXX_USE_C99_WCHAR macro and none of
them can be implemented in C89 easily.

libstdc++-v3/ChangeLog:

	PR libstdc++/110653
	* include/bits/basic_string.h (stoi, stol, stoul, stod): Do not
	depend on _GLIBCXX_USE_C99_STDLIB.
	[__LONG_WIDTH__ == __LONG_LONG_WIDTH__] (stoll, stoull): Define
	in terms of stol and stoul respectively.
	[__DBL_MANT_DIG__ == __LDBL_MANT_DIG__] (stold): Define in terms
	of stod.

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