Make libpqsrv_cancel's return const char *, not char *

Per headerscheck's C++ check.

Discussion: https://postgr.es/m/372769.1712179...@sss.pgh.pa.us

Branch
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master

Details
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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(-)

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