postgresqlPackages.pg_net: remove general -Wno-error

I wondered if this is strictly needed and it turns out that except from
the postgresql_18 version failing with

    pg_net> src/worker.c:20:14: error: no previous extern declaration for non-static variable 'worker_state' [-Werror,-Wmissing-variable-declarations]
    pg_net>    20 | WorkerState *worker_state = NULL;
    pg_net>       |              ^
    pg_net> src/worker.c:20:1: note: declare 'static' if the variable is not intended to be used outside of this translation unit
    pg_net>    20 | WorkerState *worker_state = NULL;
    pg_net>       | ^
    pg_net> 1 error generated.
    pg_net> make: *** [<builtin>: src/worker.o] Error 1

the package builds without it.

0 files changed, 0 insertions, 0 deletions