[Mesa-dev] debug feature to dump "get configs" and "chosen configs" (v2)

[Silvestrs Timofejevs]

This patch series provides an easy way to see what configs
have been returned by the 'eglGetConfigs' and 'eglChooseConfig'
functions, and give an overview of config attributes.

v2:
   a) refactor the code in line with Eric's comments
   b) rename function _snprintfStrcat, split it out and put into
      src/util/u_string.h, make it a separate patch.