Fix literalization of blobs on PostgreSQL.
Fix literalization of blobs on PostgreSQL.

It looks like using extended strings for blobs was a bad idea.
Apparently, they were fine with standard strings.  The use
of extended strings caused problems when standard conforming
strings was ON (which is the the default in Sequel).

beni55/sequel,Marketcircle/sequel,mpalmer/sequel,freshpay/sequel,yazshel/sequel,t-morgan/sequel,freshpay/sequel,pfarrell/sequel,uhoh-itsmaciek/sequel,seeARMS/sequel,nju520/sequel,offshore-safety/sequel,reubano/sequel,dennis-d/custom_sequel,gferguson-gd/sequel,nicohvi/sequel,t-morgan/sequel,offshore-safety/sequel,yazshel/sequel,chef/sequel,knut2/sequel,beni55/sequel,dennis-d/custom_sequel,tmm1/sequel,nju520/sequel,davidbegin/sequel,gferguson-gd/sequel,reubano/sequel,nicohvi/sequel,davidbegin/sequel,knut2/sequel,offshore-safety/sequel,uhoh-itsmaciek/sequel,pfarrell/sequel,bigfix/sequel,mpalmer/sequel,seeARMS/sequel