Make libpqsrv_cancel's return const char *, not char *
Per headerscheck's C++ check.
Discussion: https://postgr.es/m/372769.1712179784@sss.pgh.pa.us
Branch
------
master
Details
-------
https://git.postgresql.org/pg/commitdiff/b8b37e41ba4aae1e79dcfaeb9eb0fd7549773ff5
Modified Files
--------------
contrib/dblink/dblink.c | 2 +-
contrib/postgres_fdw/connection.c | 2 +-
src/include/libpq/libpq-be-fe-helpers.h | 4 ++--
3 files changed, 4 insertions(+), 4 deletions(-)