pgml is not compatible with plpython, if using both pgml and plpython in thesame session, postgresql will crash.minimum reproducible code:```sqlSELECT pgml.embed('intfloat/e5-small', 'hi mom');create or replace function pyudf()returns int as$$return 0$$ language 'plpython3u';```the call stack:``` Stack trace of thread 161970: #0  0x00007efc1429edb8 PyImport_Import (libpython3.9.so.1.0 + 0x9edb8)postgresml#1  0x00007efc1429f125 PyImport_ImportModule (libpython3.9.so.1.0 + 0x9f125)postgresml#2  0x00007efb04b0f496 n/a (plpython3.so + 0x10496)postgresml#3  0x00007efb04b1039d plpython3_validator (plpython3.so + 0x1139d)postgresml#4  0x0000559d0cdbc5c2 OidFunctionCall1Coll (postgres + 0x6465c2)postgresml#5  0x0000559d0c9d68bb ProcedureCreate (postgres + 0x2608bb)postgresml#6  0x0000559d0ca5030c CreateFunction (postgres + 0x2da30c)postgresml#7  0x0000559d0ce1c730 n/a (postgres + 0x6a6730)postgresml#8  0x0000559d0cc5a030 standard_ProcessUtility (postgres + 0x4e4030)postgresml#9  0x0000559d0cc545ed n/a (postgres + 0x4de5ed)postgresml#10 0x0000559d0cc546e7 n/a (postgres + 0x4de6e7)postgresml#11 0x0000559d0cc54beb PortalRun (postgres + 0x4debeb)postgresml#12 0x0000559d0cc55249 n/a (postgres + 0x4df249)postgresml#13 0x0000559d0cc576f0 PostgresMain (postgres + 0x4e16f0)postgresml#14 0x0000559d0cbc3e9c n/a (postgres + 0x44de9c)postgresml#15 0x0000559d0cbc50aa PostmasterMain (postgres + 0x44f0aa)postgresml#16 0x0000559d0c8ce7d2 main (postgres + 0x1587d2)postgresml#17 0x00007efc18427cd0 n/a (libc.so.6 + 0x27cd0)postgresml#18 0x00007efc18427d8a __libc_start_main (libc.so.6 + 0x27d8a)postgresml#19 0x0000559d0c8cee15 _start (postgres + 0x158e15)```this is because PostgreSQL is using dlopen(RTLD_GLOBAL). this will parse someof symbols into the previous opened .so file, but the others will use arelative offset in pgml.so, and will cause a null-pointer crash.this commit hide all symbols except the UDF symbols (ends with `_wrapper`) andthe magic symbols (`_PG_init` `Pg_magic_func`). so dlopen(RTLD_GLOBAL) willparse the symbols to the correct position.

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