Remove redeclaration of struct sqlca_t --- unnecessary and provokes

warnings on some compilers.

src/interfaces/ecpg/include/ecpglib.h

 /*
  * this is a small part of c.h since we don't want to leak all postgres
  * definitions into ecpg programs
- * $PostgreSQL: pgsql/src/interfaces/ecpg/include/ecpglib.h,v 1.68 2006/08/02 13:43:23 meskes Exp $
+ * $PostgreSQL: pgsql/src/interfaces/ecpg/include/ecpglib.h,v 1.69 2006/08/04 16:54:05 tgl Exp $
  */
 
 #ifndef _ECPGLIB_H
@@ -38,8 +38,6 @@ extern		"C"
 {
 #endif
 
-struct sqlca_t;
-
 void		ECPGinit_sqlca(struct sqlca_t *sqlca);
 void		ECPGdebug(int, FILE *);
 bool		ECPGstatus(int, const char *);