e04a8059a7
This reverts commits c2d1eea9e and 11b500072, as well as similar hacks elsewhere, in favor of setting up the PGDLLIMPORT macro so that it can just be used unconditionally. That can work because in frontend code, we need no marking in either the defining or consuming files for a variable exported from these libraries; and frontend code has no need to access variables exported from the core backend, either. While at it, write some actual documentation about the PGDLLIMPORT and PGDLLEXPORT macros. Patch by me, based on a suggestion from Robert Haas. Discussion: https://postgr.es/m/1160385.1638165449@sss.pgh.pa.us
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