[bug fix] ECPG: fails to recognize embedded parameters

Hello,

This is an actual problem that our customer hit. In ECPG, opening a cursor fails which is declared as follows:

EXEC SQL DECLARE cur CURSOR FOR
SELECT oid, datname
FROM pg_database
WHERE datname LIKE 'post%' ESCAPE '\' AND datconnlimit = :connlimit;

sqlstate: 07001
sqlerrm.sqlerrmc: too many arguments on line 30

The cause is that next_insert() in ecpglib unconditionally skips the next character after the backslash.

Could you review and commit the attached patch? I also attached the test program for convenience.

Regards
Takayuki Tsunakawa