ecpg enhance patch

Here is a patch that would enhance the efficiency in that skip strings
which have been already checked. The patch was made by Kazuko
Nakagawa. Michael, can you comment on this?

*** ecpglib.c.orig    Wed Dec 22 13:13:21 1999
--- ecpglib.c    Wed Dec 22 13:37:32 1999
***************
*** 398,403 ****
--- 398,404 ----     PGresult   *results;     PGnotify   *notify;     struct variable *var;
+     int    hostvarl = 0;      copiedquery = ecpg_strdup(stmt->command, stmt->lineno); 
***************
*** 569,575 ****             return false;          strcpy(newcopy, copiedquery);
!         if ((p = next_insert(newcopy)) == NULL)         {              /*
--- 570,576 ----             return false;          strcpy(newcopy, copiedquery);
!         if ((p = next_insert(newcopy+hostvarl)) == NULL)         {              /*
***************
*** 582,587 ****
--- 583,589 ----         else         {             strcpy(p, tobeinserted);
+             hostvarl = strlen(newcopy);              /*              * The strange thing in the second argument is
therest of the