CFlags ldFlags promotion

[gpx1000]

There needs to be some form of solution to capture that cFlags, cppFlags, and ldFlags could have specific requirements for a dependency.
As an example solution:
capture target_* interface family of settings and populate it within the yml. Something similar would be required for android.mk; I'd suggest creating variable entries meant to enter environment variables _CFLAGS _LDFLAGS etc variables suitable to be used in any build platform.

[gpx1000]

This is addressed by PR #52