fix 1004 Canon Lens Fixes (0.27->master)

[clanmills]

#1004 These are changes concerning Canon Lenses. They were incorrectly included in #1136.

@sridharb1 Please inspect and test on Windows. And I totally baffled by the confusion of the name of path-test being occassionally changed to pathtest. That cannot be correct. I think its a issue in contrib/vs2019/solution/samples/pathtest.vcxproj

I see there's trouble in samples/CMakeLists.txt with this. I'll investigate and fix that on 0.27-maintenance tomorrow. Sssshhh. I don't know we haven't spotted this years ago! Logged #1158

723 rmills@rmillsmbp:~/gnu/github/exiv2/0.27-maintenance/samples $ grep pathtest CMakeLists.txt 
add_executable(          pathtest  path-test.cpp ../src/utils.cpp ../src/getopt.cpp)
list(APPEND APPLICATIONS pathtest)
set_target_properties(   pathtest  PROPERTIES OUTPUT_NAME path-test )
target_include_directories(pathtest PRIVATE ${CMAKE_SOURCE_DIR}/src) # To find utils.hpp
install( TARGETS metacopy pathtest exiv2json RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})

[codecov]

Codecov Report

Merging #1157 into 0.27-maintenance will not change coverage.
The diff coverage is n/a.

@@                Coverage Diff                @@
##           0.27-maintenance    #1157   +/-   ##
=================================================
  Coverage             62.57%   62.57%           
=================================================
  Files                   158      158           
  Lines                 22826    22826           
=================================================
  Hits                  14283    14283           
  Misses                 8543     8543           

Impacted Files	Coverage Δ
src/canonmn_int.cpp	88.08% <ø> (ø)

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[sridharb1]

Looks good. Thanks.