[Bf-committers] Scons can't define strings with spaces

[Tom Edwards]

In scons, string defines cannot contain spaces. The entire value is 
wrapped in quote marks even if it has already been escape-quoted.

env['RCFLAGS'].append("-DTEST=\"a space\"")
env['RCFLAGS'].append("-DTEST=\"nospace\"")

Gives:

windres "-DTEST="a space"" -DTEST="nospace"

And the first is, of course, an invalid arg.