pgsql: Remove obsolete linux dynloader code

Remove obsolete linux dynloader code

This has been obsolete probably since the late 1990s.

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/351855fc4ebc2b5e62565f63ddbedbcada80e532

Modified Files
--------------
configure                          |   2 +-
configure.in                       |   2 +-
src/backend/port/dynloader/linux.c | 134 ++-----------------------------------
src/backend/port/dynloader/linux.h |   6 --
src/include/pg_config.h.in         |   3 -
src/include/pg_config.h.win32      |   3 -
6 files changed, 6 insertions(+), 144 deletions(-)