devel/psptoolchain-binutils: fix packaging on powerpc64le

pkg-static: Unable to access file /wrkdirs/usr/ports/devel/psptoolchain-binutils/work/stage/usr/local/powerpcle-unknown-freebsd13.0/psp/include/ansidecl.h:No such file or directory
pkg-static: Unable to access file /wrkdirs/usr/ports/devel/psptoolchain-binutils/work/stage/usr/local/powerpcle-unknown-freebsd13.0/psp/include/bfd.h:No such file or directory
pkg-static: Unable to access file /wrkdirs/usr/ports/devel/psptoolchain-binutils/work/stage/usr/local/powerpcle-unknown-freebsd13.0/psp/include/bfdlink.h:No such file or directory
pkg-static: Unable to access file /wrkdirs/usr/ports/devel/psptoolchain-binutils/work/stage/usr/local/powerpcle-unknown-freebsd13.0/psp/include/dis-asm.h:No such file or directory
pkg-static: Unable to access file /wrkdirs/usr/ports/devel/psptoolchain-binutils/work/stage/usr/local/powerpcle-unknown-freebsd13.0/psp/include/symcat.h:No such file or directory
pkg-static: Unable to access file /wrkdirs/usr/ports/devel/psptoolchain-binutils/work/stage/usr/local/powerpcle-unknown-freebsd13.0/psp/lib/libbfd.a:No such file or directory
pkg-static: Unable to access file /wrkdirs/usr/ports/devel/psptoolchain-binutils/work/stage/usr/local/powerpcle-unknown-freebsd13.0/psp/lib/libopcodes.a:No such file or directory