*: Fix WWW with broken anchors-as-comments

Case 1: WWW=https://example.com#foo

Here #foo is not part of the value of WWW since # introduces a comment
whether it's part of a word or not (quoting the word+# makes no
difference either). # needs to be escaped:

WWW=https://example.com\#foo

Case 2: WWW=https://example.com #foo

This is probably fallout from when WWW was moved from pkg-descr to
Makefile.

The anchors still exist on the actual websites too or I removed them.