Adding a missing dependency for debian

[XaaT]

Add g++ (mandatory to compile extensions used with oxidized-web compilation through gem install)

Pre-Request Checklist

• Passes rubocop code analysis (try rubocop --auto-correct)
• Tests added or adapted (try rake test)
• Changes are reflected in the documentation
• User-visible changes appended to CHANGELOG.md

Description

[codecov-io]

Codecov Report

Merging #1684 into master will increase coverage by 0.1%.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           master   #1684     +/-   ##
========================================
+ Coverage   62.49%   62.6%   +0.1%     
========================================
  Files          30      30             
  Lines        1493    1492      -1     
========================================
+ Hits          933     934      +1     
+ Misses        560     558      -2

Impacted Files	Coverage Δ
lib/oxidized/node.rb	71.32% <0%> (-0.2%)	⬇️
lib/oxidized/output/git.rb	18.25% <0%> (+1.58%)	⬆️

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[XaaT]

Without g++

root@oxidized:~# gem install oxidized-web
Building native extensions. This could take a while...
ERROR: Error installing oxidized-web:
ERROR: Failed to build gem native extension.

current directory: /var/lib/gems/2.3.0/gems/charlock_holmes-0.7.6/ext/charlock_holmes

/usr/bin/ruby2.3 -r ./siteconf20190117-1206-1m9m8s2.rb extconf.rb
checking for main() in -licui18n... yes
checking for main() in -licui18n... yes
checking for unicode/ucnv.h... yes
checking for main() in -lz... yes
checking for main() in -licuuc... yes
checking for main() in -licudata... yes
creating Makefile

To see why this extension failed to compile, please check the mkmf.log which can be found here:

/var/lib/gems/2.3.0/extensions/x86_64-linux/2.3.0/charlock_holmes-0.7.6/mkmf.log

current directory: /var/lib/gems/2.3.0/gems/charlock_holmes-0.7.6/ext/charlock_holmes
make "DESTDIR=" clean

current directory: /var/lib/gems/2.3.0/gems/charlock_holmes-0.7.6/ext/charlock_holmes
make "DESTDIR="
compiling converter.c
compiling encoding_detector.c
compiling ext.c
compiling transliterator.cpp
make: g++ : commande introuvable
Makefile:231 : la recette pour la cible « transliterator.o » a échouée
make: *** [transliterator.o] Erreur 127

make failed, exit code 2

Gem files will remain installed in /var/lib/gems/2.3.0/gems/charlock_holmes-0.7.6 for inspection.
Results logged to /var/lib/gems/2.3.0/extensions/x86_64-linux/2.3.0/charlock_holmes-0.7.6/gem_make.out

"commande introuvable" = command not found

[wk]

Thanks! It seems that while the CentOS instructions were already updated (with the equivalent gcc-c++ package), the Ubuntu instructions were not. This is indeed a dependency for charlock_holmes / ICU.