Fix conversion table generator scripts.

Thomas Munro <tmunro@postgresql.org>

Commit: a5073871ea655e37759f22f30c4c70359ad9759b
Author: Thomas Munro <tmunro@postgresql.org>
Date: 2020-07-22T04:50:03Z
Releases: 14.0
Fix conversion table generator scripts.

convutils.pm used implicit conversion of undefined value to integer
zero.  Some of conversion scripts are susceptible to regexp greediness.
Fix, avoiding whitespace changes in the output.  Also update ICU URLs
that moved.

No need to back-patch, because the output of these scripts is also in
the source tree so we shouldn't need to rerun them on back-branches.

Author: Kyotaro Horiguchi <horikyoga.ntt@gmail.com>
Discussion: https://postgr.es/m/CA%2BhUKGJ7SEGLbj%3D%3DTQCcyKRA9aqj8%2B6L%3DexSq1y25TA%3DWxLziQ%40mail.gmail.com

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