* easy proposals to synch 2.4.x and trunk

  - log.c: avoid needless apr_pstrdup()
  - Use apr_pstrmemdup instead of apr_pstrndup when this is safe.
  - Use apr_pstrmemdup instead of apr_pstrndup when this is safe.
  - Remove redundant check
  - 'ap_getword_conf' does not return NULL but an empty string
  - Ease logic around 'ap_getword_conf' and drop useless line of code.
  - 'ap_getword_conf' can not return NULL
  - 'ap_getword_conf' can not return NULL
  - Remove redundant check (already performed the line before)
  - Use 'apr_pstrmemdup' instead of 'apr_pstrndup' when applicable
trunk patches:
  - https://svn.apache.org/viewvc?view=revision&revision=1532122
  - https://svn.apache.org/viewvc?view=revision&revision=1549676
  - https://svn.apache.org/viewvc?view=revision&revision=1549680
  - https://svn.apache.org/viewvc?view=revision&revision=1550651
  - https://svn.apache.org/viewvc?view=revision&revision=1551005
  - https://svn.apache.org/viewvc?view=revision&revision=1551009
  - https://svn.apache.org/...