Fixing QXmppGlobal.h for static linking

[leobasilio]

Following the discussion on issue #297, here's my attempt to solve it.

[codecov]

Codecov Report

Merging #299 into master will increase coverage by 0.48%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #299      +/-   ##
==========================================
+ Coverage   75.54%   76.02%   +0.48%     
==========================================
  Files         205      205              
  Lines       17130    17131       +1     
==========================================
+ Hits        12941    13024      +83     
+ Misses       4189     4107      -82     

Impacted Files	Coverage Δ
src/base/QXmppLogger.h	9.09% <0.00%> (-72.73%)	⬇️
src/client/QXmppRemoteMethod.h	0.00% <0.00%> (ø)
src/base/QXmppStanza_p.h	91.83% <0.00%> (+91.83%)	⬆️
src/base/QXmppBitsOfBinaryDataList.h	100.00% <0.00%> (+100.00%)	⬆️

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[lnjX]

Thanks for the PR. :)
I added a commit that makes this less hacky by adding a proper variable in cmake. Can you confirm that this still works all properly?

[leobasilio]

Thanks for the fix. I'm really not that experienced with cmake. Just tried to be the least intrusive as possible. From what I can tell, it's working perfectly. 👍