pgsql: libpq-oauth: use correct c_args in meson.build

libpq-oauth: use correct c_args in meson.build

Copy-paste bug from b0635bfda: libpq-oauth.so was being built with
libpq_so_c_args, rather than libpq_oauth_so_c_args. (At the moment, the
two lists are identical, but that won't be true forever.)

Reviewed-by: Chao Li <li.evan.chao@gmail.com>
Discussion: https://postgr.es/m/CAOYmi%2BmrGg%2Bn_X2MOLgeWcj3v_M00gR8uz_D7mM8z%3DdX1JYVbg%40mail.gmail.com
Backpatch-through: 18

Branch
------
REL_18_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/023a3c786b81bf9e0ca023f8e279f03b197b189f

Modified Files
--------------
src/interfaces/libpq-oauth/meson.build | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)