pgsql: Back-patch non-static ExecuteSqlQueryForSingleRow().

Back-patch non-static ExecuteSqlQueryForSingleRow(). Back-patch a subset of commit 47e59697679a0877e0525c565b1be437487604a7 to 9.4 and 9.3. The next commit adds calls to this function. Security: CVE-2018-1058 Branch -- REL9_4_STABLE Details --- https://git.postgresql.org/pg/commitdiff/

pgsql: Back-patch non-static ExecuteSqlQueryForSingleRow().

Back-patch non-static ExecuteSqlQueryForSingleRow(). Back-patch a subset of commit 47e59697679a0877e0525c565b1be437487604a7 to 9.4 and 9.3. The next commit adds calls to this function. Security: CVE-2018-1058 Branch -- REL9_3_STABLE Details --- https://git.postgresql.org/pg/commitdiff/