Removed a method using wxColour from non-GUI benchmark code.

No idea how could this work before but the presence of this code in the
non-GUI benchmark project prevented it from building. As it's not used anyhow,
just remove it.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74734 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Rewrite wxLogXXX() macros to avoid "ambiguous else" warnings.

Use a dummy for loop instead of an if statement to avoid all problems with the
dangling else clauses: both the need for an artificially inversed "if" to make
the code like

	if ( something )
		wxLogError("...");
	else
		something-else;

to work as expected and to avoid warnings given by some versions of g++ and
clang for the code above advising to add explicit braces.

Closes #11829.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74735 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775