LU-16962 build: parallel configure cleanup

LU-16962 build: parallel configure cleanup

LC_REGISTER_SHRINKER_FORMAT_NAMED macro should use
  register_shrinker_format

LC_HAVE_FILEMAP_GET_FOLIOS_CONTIG macro should use
  filemap_get_folios_contig

LN_SRC_CONFIG_STRSCPY_EXISTS and LN_CONFIG_STRSCPY_EXISTS
  are not defined. Remove the references.

Test-Parameters: trivial
HPE-bug-id: LUS-11709
Fixes: 0006eb3644 ("LU-16328 llite: migrate_folio, vfs_setxattr")
Fixes: ca992899d5 ("LU-16351 llite: Linux 6.1 prandom, folios_contig, vma_iterator")
Fixes: 7fe7f4ca06 ("LU-16520 build: Move strscpy to libcfs common header")
Signed-off-by: Shaun Tancheff <shaun.tancheff@hpe.com>
Change-Id: I0cb630d035a23edfa353040f4c0d25c46eb417d8
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/51670
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Petros Koutoupis <petros.koutoupis@hpe.com>
Reviewed-by: xinliang <xinliang.liu@linaro.org>