collate only by code points.ANDROID: was __strxfrm_l in Musl.

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Musl是一个轻量级的C标准库，设计作为GNU C library (glibc)、 uClibc或Android Bionic的替代用于嵌入式操作系统和移动设备。它遵循POSIX 2008规格和 C99 标准，采用MIT许可证授权，使用Musl的Linux发行版和项目包括sabotage，bootstrap-linux，LightCube OS等等。(musl is a libc,an implementation of the standard library functionality d