MDL-80173 reportbuilder: remove various Oracle support/workarounds.
"True happiness is to rejoice in the
<removal of Oracle compatibility>."
Reference: ba1f9cb2, 892b68d5, c63af985, 208adcf3, 9a244403, 3894fa94,
62d22c66, 628541b5, 429508a7.
Paul Holden