Trying to fix the xxx_SRC_DIRS crap again.
Trying to fix the xxx_SRC_DIRS crap again.

This time don't include main.C when finding sources as it leads to
duplicate symbols.

Also fixing some spacing issues in the .mk files.

This reverts the original reversion commit,
aad0d238056addc137347e6a9c49d838a46cb901.

Refs #1767.

r17239

idaholab/falcon,idaholab/falcon,idaholab/falcon,idaholab/falcon,aeslaughter/falcon,aeslaughter/falcon,aeslaughter/falcon