Makefile.am: substitute $(abs_build_dir) → $(abs_builddir)
Makefile.am: substitute $(abs_build_dir) → $(abs_builddir)

The variables $(builddir) and $(abs_builddir) were introduced in
Autoconf 2.53 back in 2002.

Thus if $(builddir) is available, so is $(abs_builddir).  There is no
need to duplicate the functionality of the latter by using $(abs_build_dir).

Signed-Off-By: Дилян Палаузов <2be63d7079beb04b5bfbe9a680bd5e7cbfcb4e9d@aegee.org>

01org/tpm2.0-tools,01org/tpm2.0-tools,01org/tpm2.0-tools