Fixing gentoo build instructions

[mtao]

-99999 -> 9999 in the ebuild path

[codecov-io]

Codecov Report

Merging #64 into master will increase coverage by 0.41%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #64      +/-   ##
==========================================
+ Coverage   97.61%   98.03%   +0.41%     
==========================================
  Files          80       79       -1     
  Lines        5455     5089     -366     
==========================================
- Hits         5325     4989     -336     
+ Misses        130      100      -30

Impacted Files	Coverage Δ
src/Corrade/Utility/Configuration.cpp	98.06% <0%> (-0.69%)	⬇️
src/Corrade/Utility/FileWatcher.cpp	96.15% <0%> (-0.52%)	⬇️
src/Corrade/Utility/Unicode.cpp	97.59% <0%> (-0.51%)	⬇️
src/Corrade/Utility/ConfigurationGroup.cpp	81.48% <0%> (-0.29%)	⬇️
src/Corrade/Utility/Debug.cpp	96.51% <0%> (-0.25%)	⬇️
src/Corrade/Interconnect/Emitter.h	98.57% <0%> (-0.08%)	⬇️
src/Corrade/Utility/Arguments.cpp	97.99% <0%> (-0.07%)	⬇️
src/Corrade/Utility/Tweakable.h	100% <0%> (ø)	⬆️
src/Corrade/Utility/Endianness.h	100% <0%> (ø)	⬆️
src/Corrade/Utility/System.cpp	100% <0%> (ø)	⬆️
... and 38 more

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[mosra]

Merged as 936c363. Thanks a lot!