Similar to the other functions in the strfrom class, strfromf128 calls
__printf_fp in order to convert the floating-point value to characters.
This requires the value of IO_MTSAFE_IO.
Tested for powerpc64le and s390x.
* sysdeps/ieee754/float128/Makefile (CFLAGS-strfromf128.c): Add
$(libio-mtsafe) to get the value of IO_MTSAFE_IO.