Merge pull request #1306 from RosettaCommons/roccomoretti/external_build_flags2
Compile & Link flags settings for external libraries
Per a request by Andrew, update the new external build scheme to allow you to specify external-library specific compiler and linker flags.
Just add them to the appropriate section of the *.external.settings file. (Should work with both scons and CMake, although mixed C/C++ libraries under CMake only get a single set of flags.)