glibc: update to latest 2.27 commit

glibc: update to latest 2.27 commit

daf88b1dd1 Add NEWS entry for CVE-2020-6096 (bug 25620)
b29853702e arm: CVE-2020-6096: Fix multiarch memcpy for negative length [BZ #25620]
bad8d5ff60 arm: CVE-2020-6096: fix memcpy and memmove for negative length [BZ #25620]
d64ad0a517 Fix use-after-free in glob when expanding ~user (bug 25414)
34ce87638c Fix array overflow in backtrace on PowerPC (bug 25423)
0df8ecff9e misc/test-errno-linux: Handle EINVAL from quotactl
26f5442ec1 <string.h>: Define __CORRECT_ISO_CPP_STRING_H_PROTO for Clang [BZ #25232]
4b64a4245c intl/tst-gettext: fix failure with newest msgfmt
dc7f51bda9 aarch64: Fix DT_AARCH64_VARIANT_PCS handling [BZ #26798]
8edc96aa33 aarch64: add HWCAP_ATOMICS to HWCAP_IMPORTANT
599ebfacc0 aarch64: Remove HWCAP_CPUID from HWCAP_IMPORTANT

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>