any new side effects seen ?
No, Not yet.
IMHO, it should not create any side-effects. Only the standard wx icon inclusion is removed. Rest of the wx resources will be added. 

They've already replaced that line in newer version of wx. But unfortunately, wx-2.6.4 got the buggy one. 

Might make a mightly with wx2.6.4, but once more a patched one because of this issue .
Jolly nice wx ......
No, not necessary. The runtime dll will not be affected. Only during compilation of any exe file based on wx-2.6.4 (in this case 
codeblocks.exe), that patch is necessary. 

Regards,
Biplab