The actual fix as been done by "pkglint -F */*/buildlink3.mk", and was
reviewed manually.
There are some .include lines that still are indented with zero spaces
although the surrounding .if is indented. This is existing practice.
Several tools are built with GNAT sources and they have to be the
exact source that built the Ada compiler that builds the tool. To
ensure this, a common trick to the create a library with those sources
and link the library instead of using the embedded source files which
never match the FSF compiler properly. The first tool this new
gcc 4.9.0-based library will be used for is devel/gprbuild-aux