find/glob: Don't use $. as a non-matching regex

[tavianator]

The oniguruma version built by onig_sys does not include the commit
6f7b0aa ("add ONIG_SYN_BRE_ANCHOR_AT_EDGE_OF_SUBEXP into
ONIG_SYNTAX_POSIX_BASIC and ONIG_SYNTAX_GREP"), causing $. to actually
match a literal newline.

Using $. is not portable anyway; POSIX says

A <dollar-sign> ( '$' ) shall be an anchor when used as the last
character of an entire BRE.

[github-actions]

Commit 4be8be2 has GNU testsuite comparison:

Run GNU findutils tests: GNU tests summary = TOTAL: 651 / PASS: 481 / FAIL: 167 / ERROR: 2
Run GNU findutils tests: Changes from main: PASS +0 / FAIL +0 / ERROR +0 / SKIP +0 
Run GNU findutils tests: Gnu tests No changes
Run BFS tests: Congrats! The bfs test posix/name_backslash is now passing!
Run BFS tests: Changes from main: PASS +1 / SKIP +0 / FAIL -1
Run BFS tests: BFS tests summary = TOTAL: 317 / PASS: 247 / SKIP: 6 / FAIL: 64

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.29%. Comparing base (b641b85) to head (e8fdd68).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #457   +/-   ##
=======================================
  Coverage   77.29%   77.29%           
=======================================
  Files          36       36           
  Lines        4436     4436           
  Branches      991      991           
=======================================
  Hits         3429     3429           
  Misses       1004     1004           
  Partials        3        3           

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[github-actions]

Commit e8fdd68 has GNU testsuite comparison:

Run GNU findutils tests: GNU tests summary = TOTAL: 651 / PASS: 481 / FAIL: 167 / ERROR: 2
Run GNU findutils tests: Changes from main: PASS +0 / FAIL +0 / ERROR +0 / SKIP +0 
Run GNU findutils tests: Gnu tests No changes
Run BFS tests: Congrats! The bfs test posix/name_backslash is now passing!
Run BFS tests: Changes from main: PASS +1 / SKIP +0 / FAIL -1
Run BFS tests: BFS tests summary = TOTAL: 317 / PASS: 247 / SKIP: 6 / FAIL: 64

[hanbings]

thanks!