[rfc][icedtea-web] make missing tagsoup more visible

[Jiri Vanek]

This patch is making missing tagsoup during build more visisble.
Intended for 1.6 and head.

See also:  http://icedtea.classpath.org/bugzilla/show_bug.cgi?id=2303#c9 and following comments

J.
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