Makefile.am: add mkdir testsuite
Makefile.am: add mkdir testsuite

If we are note building in the existing source tree and have disabled
dependency-tracking then the testsuite directory is not created during
the configure phase and will not exist when the cp of ROOTFS_PRISTINE
occurs, thus causing an error and fail.

lpereira/kmod,lucasdemarchi/kmod,lpereira/kmod,pmmccorm/kmod,lpereira/kmod,pmmccorm/kmod,pmmccorm/kmod,lucasdemarchi/kmod,Distrotech/kmod,lucasdemarchi/kmod,Distrotech/kmod,Distrotech/kmod