Auto-sync with upstream branch release/2.26/master
    
    Upstream commit: a76376df7c07e577a9515c3faa5dbd50bda5da07
    
    - CVE-2017-15670: glob: Fix one-byte overflow (#1504807)
    - CVE-2017-15671: glob: Fix memory leak (#1504807)
    - sysconf: Fix missing definition of UIO_MAXIOV on Linux (#1504165)
    - nss_files: Avoid large buffers with many host addresses (swbz#22078)
    - nss_files: Use struct scratch_buffer for gethostbyname (swbz#18023)
    - aarch64: Optimized implementation of memcpy, memmove for Qualcomm Falkor