Minor corrections in configure and prepare phase

Since ImageMagick can take long to build, we are now building it in
parallel. Also, the part where we replace an `_' with `\_' in the software
version at the end of the configure script was removed. It is more
clear/readable that the actual rule that includes such a name deals with
the underline (as is the case for `sip_tpv' which already dealt with it).

Finally, I noticed that the checks at the start of `top-prepare' were
missing new-lines. I had forgot that the Make single-shell variable isn't
activated in this stage yet.

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