Merge remote-tracking branch 'remotes/vivier2/tags/trivial-branch-for-6.0-pull-request' into staging

Pull request trivial-patches 20201214

# gpg: Signature made Mon 14 Dec 2020 15:52:07 GMT
# gpg:                using RSA key CD2F75DDC8E3A4DC2E4F5173F30C38BD3F2FBE3C
# gpg:                issuer "laurent@vivier.eu"
# gpg: Good signature from "Laurent Vivier <lvivier@redhat.com>" [full]
# gpg:                 aka "Laurent Vivier <laurent@vivier.eu>" [full]
# gpg:                 aka "Laurent Vivier (Red Hat) <lvivier@redhat.com>" [full]
# Primary key fingerprint: CD2F 75DD C8E3 A4DC 2E4F  5173 F30C 38BD 3F2F BE3C

* remotes/vivier2/tags/trivial-branch-for-6.0-pull-request:
  configure / meson: Move check for linux/btrfs.h to meson.build
  configure / meson: Move check for sys/kcov.h to meson.build
  configure / meson: Move check for sys/signal.h to meson.build
  configure / meson: Move check for drm.h to meson.build
  configure / meson: Move check for pty.h to meson.build
  configure: Remove the obsolete check for ifaddrs.h
  blockdev: Fix a memleak in drive_backup_prepare()
  block/file-posix: fix a possible undefined behavior
  elf2dmp/pdb: Plug memleak in pdb_init_from_file
  elf2dmp/qemu_elf: Plug memleak in QEMU_Elf_init
  configure: Test if $make actually exists
  ads7846: moves from the hw/display folder to the hw/input folder.
  CODING_STYLE.rst: Be less strict about 80 character limit
  fsdev: open brace '{' following struct go on the same line
  hw/pci-host/pam: Replace magic number by PAM_REGIONS_COUNT definition
  hw/xen: Don't use '#' flag of printf format
  MAINTAINERS: update my email address
  qemu-options.hx: Fix minor issues in icount documentation
  target/i386: tracing: format length values as hex

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>