message: Remove Wshadow from GCC flags
diff: @@ -261,7 +261,7 @@ if(CAF_MORE_WARNINGS)
  "-Wnon-virtual-dtor -Wnonnull -Woverflow "
  "-Woverlength-strings -Wparentheses "
  "-Wpmf-conversions -Wpointer-arith -Wreorder "
  - "-Wreturn-type -Wsequence-point -Wshadow "
  + "-Wreturn-type -Wsequence-point "
  "-Wsign-compare -Wswitch -Wtype-limits -Wundef "
  "-Wuninitialized -Wunused -Wvla -Wwrite-strings")
  endif()
  