package/{glibc, localedef}: bump to version 2.31

package/{glibc, localedef}: bump to version 2.31

For glibc 2.31.x:

  - Update LICENSES file hash due to url change:
    "Prefer https to http for gnu.org and fsf.org URLs"

  - riscv64 does not build with kernel headers < 5.0, but upstream
    has not yet comitted a single fix, neither in master nor in the
    maintenance branch:
       https://sourceware.org/ml/libc-alpha/2020-02/msg00018.html

For localedef 2.31.x:

  - Remove upstream patch for localedef:
    0003-localedef-Use-initializer-for-flexible-array-member-.patch

Note that this version bump required some patches applied on
several packages (already applied):
    [Busybox] 13f2d688a24f47446af236829bd6ca194d5aea5b
    [openssh] bad75bca315dbd2c69f8a9cb02fa9f27636e3d48
    [gcc] disable libsanitizer with gcc 7.5

See:
https://sourceware.org/legacy-ml/libc-announce/2020/msg00001.html

Tested by toolchain builder:
https://gitlab.com/kubu93/toolchains-builder/pipelines/129551000

Signed-off-by: Romain Naour <romain.naour@smile.fr>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>