mate-control-center 1.24.0 release

Changes since the last release: v1.23.3...v1.24.0

mate-control-center 1.24.0

tx: sync with transifex
mate-theme-info: fix memory leak
mate-wp-info: fix memory leak
glib-genmarshal: Using --header and --body at the same time is deprecated
build: show compiler/flags info on configure summary
build: do not override WARN_CFLAGS
build: use warning flags
time-admin: make portable backward file path
appearance: backgrounds dir should be portable
appearance: remove I/O error on window close
autoconf: AC_PROG_CC was called before AX_CHECK_ENABLE_DEBUG
Fix build using gcc 10 -fno-common flag