FFADO

Create branch for FFADO 2.4.x from trunk.

SConstruct: bump version number to 2.4.0 in preparation for a release.

README: update for version 2.4.0.

Additional scons3 compatibility fixes (add implicit bytes/string conversions). Within the scons scripts, some of the env[VAR] calls return bytes under scons3. Implicit conversion of bytes to strings has been removed in python3 which necessitates ... [More] the use of decode() in some instances which expect strings to prevent type mismatch errors. This change does not affect compatibility with scons2. Thanks to Orcan Ogetbil for his scons3 tests and the patch (via the ffado-devel mailing list). [Less]

Support the "ppc64le" architecture. The ppc64le is basically the ppc64 architecture operating in little endian mode (to port x86 applications easier). The Fedora build servers are "power8" systems, requiring an extension of the PPC 64-bit test ... [More] in order to compile with the correct word size. Thanks to Orcan Ogetbil for the patch (via ffado-devel mailing list). [Less]

SConstruct: add one more "b" prefix missed from r2715. From Orcan Ogetbil.

SConstruct: add byte-string prefix to prevent TypeErrors? in Python3/scons3. Patch from Orcan Ogetbil.

Remove some additional "has_key()" calls which were omitted from r2713.

SConstruct: use "in" operator rather than has_key(). The former works in python2 (scons2) and python3 (scons3). Patch from Orcan Ogetbil.

Fixes for scons3/python3 in doxygen-related scripts. Apply some fixes needed for use under scons3/python3. The resulting code seems to run correctly with scons2 under python2 so there's no obvious reason these can't go in now. Thanks to Orcan Ogetbil for the patch.