Remove unused DECLS from src/libudev/{conf-files,def,exit-status,hashmap,util}.h

The following unused DECLS are removed:

  DEFAULT_TIMEOUT_USEC
  DEFAULT_RESTART_USEC
  DEFAULT_CONFIRM_USEC
  DEFAULT_EXIT_USEC
  SIGNALS_CRASH_HANDLER
  SIGNALS_IGNORE
  EXIT_INVALIDARGUMENT
  EXIT_NOTIMPLEMENTED
  EXIT_NOPERMISSION
  EXIT_NOTINSTALLED
  EXIT_NOTCONFIGURED
  EXIT_NOTRUNNING
  EXIT_CHDIR
  EXIT_NICE
  EXIT_FDS
  EXIT_EXEC
  EXIT_MEMORY
  EXIT_LIMITS
  EXIT_OOM_ADJUST
  EXIT_SIGNAL_MASK
  EXIT_STDIN
  EXIT_STDOUT
  EXIT_CHROOT
  EXIT_IOPRI
  EXIT_TIMERSLACK
  EXIT_SECUREBITS
  EXIT_SETSCHEDULER
  EXIT_CPUAFFINITY
  EXIT_GROUP
  EXIT_USER
  EXIT_CAPABILITIES
  EXIT_CGROUP
  EXIT_SETSID
  EXIT_CONFIRM
  EXIT_STDERR
  EXIT_TCPWRAP
  EXIT_PAM
  EXIT_NETWORK
  EXIT_NAMESPACE
  EXIT_NO_NEW_PRIVILEGES
  EXIT_SECCOMP
  EXIT_STATUS_MINIMAL
  EXIT_STATUS_SYSTEMD
  EXIT_STATUS_LSB
  EXIT_STATUS_FULL
  HASHMAP_FOREACH_KEY
  HASHMAP_FOREACH_BACKWARDS
  FORMAT_TIMESTAMP_MAX
  FORMAT_TIMESTAMP_PRETTY_MAX
  FORMAT_TIMESPAN_MAX
  FORMAT_BYTES_MAX
  ANSI_HIGHLIGHT_ON
  ANSI_RED_ON
  ANSI_HIGHLIGHT_RED_ON
  dual_timestamp_is_set
  newa
  newdup
  FOREACH_WORD
  FOREACH_WORD_SEPARATOR
  NULSTR_FOREACH
  _cleanup_pclose_
  _cleanup_umask_
  _cleanup_globfree_
  DRAW_TREE_VERT
  DRAW_TREE_BRANCH
  DRAW_TREE_RIGHT
  DRAW_TREE_SPACE
  DRAW_TRIANGULAR_BULLET
  _DRAW_SPECIAL_CHAR_MAX
  FOREACH_LINE
  procfs_file_alloca

The following unused struct defs were removed:

  struct ExitStatusSet

The following unused static inline funcs were remvoed:

  static inline int safe_atolu
  static inline int safe_atoli
  static inline int safe_atolu
  static inline int safe_atoli
  static inline int safe_atou32
  static inline int safe_atoi32
  static inline int safe_atou64
  static inline int safe_atoi64
  static inline const char* yes_no
  static inline const char* strempty
  static inline const char* strnull
  static inline const char *strna
  static inline void pclosep
  static inline void umaskp

NOTE: Some unused DECLS were retained if they formed part of a logical
series, eg. definition of time units.

Signed-off-by: Anthony G. Basile <blueness@gentoo.org>