[PATCH 0/5] Perl module coverage

[Ralf Wildenhues]

I'm applying this patch series to the perl-coverage branch and merging
it into master.  It improves coverage for Version.pm, Wrap.pm,
Condition.pm, and DisjConditions.pm, where now, only statements aren't
counted as covered which consist of code used with ithreads only.

The last patch is a very small improvement for an unnecessary condition
check that became obvious by looking at coverage results.  Improves
condition coverage by having one less unreachable condition.  :-)

Coverage results for lib/Automake/tests suite before/after the merge:

---------------------------- ------ ------ ------ ------ ------ ------ ------
File                           stmt   bran   cond    sub    pod   time  total
---------------------------- ------ ------ ------ ------ ------ ------ ------
...b/Automake/ChannelDefs.pm   29.6    3.6    n/a   41.2   88.9    0.0   29.6
.../lib/Automake/Channels.pm   34.8    8.1    0.0   50.0  100.0    0.1   32.0
...lib/Automake/Condition.pm   97.8   94.8  100.0   96.2   94.7   97.3   96.9
...utomake/DisjConditions.pm   70.2   60.0    n/a   68.4  100.0    1.8   70.5
...e/lib/Automake/Version.pm   72.4   60.0   66.7   80.0  100.0    0.1   69.6
...make/lib/Automake/Wrap.pm   84.8   50.0  100.0   80.0   66.7    0.0   78.9
[...]

---------------------------- ------ ------ ------ ------ ------ ------ ------
File                           stmt   bran   cond    sub    pod   time  total
---------------------------- ------ ------ ------ ------ ------ ------ ------
...b/Automake/ChannelDefs.pm   32.4    3.6    n/a   47.1  100.0    0.0   32.8
.../lib/Automake/Channels.pm   52.5   27.4   19.0   60.5  100.0    0.2   48.4
...lib/Automake/Condition.pm  100.0  100.0  100.0  100.0  100.0   97.0  100.0
...utomake/DisjConditions.pm   94.7  100.0    n/a   94.7  100.0    1.8   96.2
...e/lib/Automake/Version.pm  100.0  100.0  100.0  100.0  100.0    0.4  100.0
...make/lib/Automake/Wrap.pm  100.0  100.0  100.0  100.0  100.0    0.1  100.0
[...]