Fix Irix lens names in pentaxmn_int.cpp

[D4N]

This fixes #1084.

[codecov[bot]]

Codecov Report

Merging #1085 into master will increase coverage by 0.04%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1085      +/-   ##
==========================================
+ Coverage   71.81%   71.85%   +0.04%     
==========================================
  Files         152      152              
  Lines       17651    17725      +74     
==========================================
+ Hits        12676    12737      +61     
- Misses       4975     4988      +13

Impacted Files	Coverage Δ
src/pentaxmn_int.cpp	86.09% <ø> (ø)	:arrow_up:
src/nikonmn_int.cpp	62.99% <0%> (+2.83%)	:arrow_up:

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[D4N]

I still need to add the reproducers that were reported in #1084.

[clanmills]

Let's see if we can include this in v1.00 and add test code.

[kmilos]

Superseded by https://github.com/Exiv2/exiv2/pull/1118