Tweak some doc strings and code trivia related to the detection of SQLite.
Tweak some doc strings and code trivia related to the detection of SQLite.

* build/ac-macros/sqlite.m4
  (SVN_LIB_SQLITE): Correct the doc string. Stop passing an (unused)
    argument to SVN_SQLITE_VERNUM_PARSE.
  (SVN_SQLITE_VERNUM_PARSE): Remove an unused argument assignment. Expand
    the doc string.
  (SVN_SQLITE_MIN_VERNUM_PARSE): Add a doc string.

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion