Stephen Kelly b8cc6f4eba include_directories: Fix handling of empty or space-only entries
Since commit 0d46e9a0 (Store includes from the same include_directories
call together., 2013-01-20) we accidentally use such entries.  Fix the
code to drop them instead.  Update the IncludeDirectories test to cover
this case.

Reported-by: Christophe Giboudeaux <cgiboudeaux@gmx.com>
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