Drop backported 0001-bison-test-fixes-Do-not-use-obsolete-bison-construct.patch

Test cases have been completely rearranged upstream, so ptest support
is fully rewritten.

Merge split bb/inc as there's no other user of the .inc [RB]

As automake insists adding BUILD_SOURCES as a dependency to the "all" target,
remove tests/ from the build unless ptests are enabled.  This means native
builds don't need a bison dependency. If ptests are enabled, we build-depend on
flex-native and bison-native for the test suite, and tell it to use the
flex-native binary instead of attempting to run the cross flex it just
built. [RB]

Move in-tree files from files/ to flex/ for consistency. [RB]

Signed-off-by: Alexander Kanavin <alexander.kanavin@linux.intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>

Install flex test suite and run it as ptest.

Signed-off-by: Chong Lu <Chong.Lu@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>