Don't error if path is already fullpath

[mCodingLLC]

copyfile raises a SameFileError if the source and destination are the same. In this case, the error should be ignored.

[codecov[bot]]

Codecov Report

Merging #13 (40ba765) into master (dda7803) will increase coverage by 3.48%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #13      +/-   ##
==========================================
+ Coverage   87.57%   91.05%   +3.48%     
==========================================
  Files          43       43              
  Lines        3558     4283     +725     
==========================================
+ Hits         3116     3900     +784     
+ Misses        442      383      -59     

Impacted Files	Coverage Δ
src/python/magnum/meshtools.cpp	93.33% <0.00%> (-6.67%)	:arrow_down:
src/python/magnum/trade.cpp	96.32% <0.00%> (-2.90%)	:arrow_down:
src/python/corrade/containers.cpp	85.71% <0.00%> (-1.01%)	:arrow_down:
src/python/magnum/shaders.cpp	98.41% <0.00%> (-0.41%)	:arrow_down:
src/python/magnum/magnum.cpp	100.00% <0.00%> (ø)
src/python/corrade/corrade.cpp	100.00% <0.00%> (ø)
src/python/magnum/primitives.cpp	100.00% <0.00%> (ø)
src/python/magnum/scenegraph.trs.cpp	100.00% <0.00%> (ø)
src/python/magnum/math.matrixfloat.cpp	100.00% <0.00%> (ø)
src/python/magnum/math.vectorfloat.cpp	100.00% <0.00%> (ø)
... and 17 more

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[mosra]

Hi, thanks for the contribution!

The change makes sense, but can you explain what triggered it so I know why this was needed? Was it due to an in-source CMake build, for example?

[mCodingLLC]

Sure thing, indeed this happened because I was doing an in-source build.

[mosra]

Thank you!