Improve error reporting for unsupported effective_io_concurrency setting.

Give a specific error complaining about lack of posix_fadvise() when
someone tries to set effective_io_concurrency > 0 on platforms
without that.

This probably isn't worth extensive back-patching, but I (tgl) felt
cramming it into v11 was reasonable.

James Robinson

Discussion: 
https://postgr.es/m/[email protected]
Discussion: 
https://postgr.es/m/[email protected]

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/2b04dfc4724970231ac338aa71e529c823fc5ff6

Modified Files
--------------
src/backend/utils/misc/guc.c   | 10 ++++++++--
src/include/pg_config_manual.h |  4 +++-
2 files changed, 11 insertions(+), 3 deletions(-)

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