Snippets for msgpack-c 7.0.0 from Fedora s390x

Sourced from https://kojipkgs.fedoraproject.org/packages/msgpack-c/7.0.0/3.fc45/data/logs/s390x/build.log.

• /builddir/build/BUILD/msgpack-c-7.0.0-build/msgpack-c-7.0.0/redhat-linux-build/include/msgpack/pack_template.h:885:39: warning: conversion from ‘size_t’ {aka ‘long unsigned int’} to ‘uint16_t’ {aka ‘short unsigned int’} may change value [-Wconversion]
    885 |             _msgpack_store16(&buf[1], l);
  

• /builddir/build/BUILD/msgpack-c-7.0.0-build/msgpack-c-7.0.0/redhat-linux-build/include/msgpack/pack_template.h:891:39: warning: conversion from ‘size_t’ {aka ‘long unsigned int’} to ‘uint32_t’ {aka ‘unsigned int’} may change value [-Wconversion]
    891 |             _msgpack_store32(&buf[1], l);
  

• /builddir/build/BUILD/msgpack-c-7.0.0-build/msgpack-c-7.0.0/test/buffer_c.cpp:126:15: warning: ignoring return value of ‘ssize_t writev(int, const iovec*, int)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
    126 |         writev(fd, iov, (int)iovcnt);
        |         ~~~~~~^~~~~~~~~~~~~~~~~~~~~~
  

• /builddir/build/BUILD/msgpack-c-7.0.0-build/msgpack-c-7.0.0/test/buffer_c.cpp:129:13: warning: ignoring return value of ‘ssize_t read(int, void*, size_t)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
    129 |         read(fd, buf, len);
        |         ~~~~^~~~~~~~~~~~~~