libvirt: fix PTEST_DIR
libvirt: fix PTEST_DIR

The default PTEST_DIR only works for 32bit.

Signed-off-by: Mihaela Sendrea <2a17ed34ece27c6e19141d09ddd58b7bbacd2de7@enea.com>
Signed-off-by: Bruce Ashfield <284cc737d174a260eec2a2a6324a304f84b1ae0f@windriver.com>

lgirdk/meta-virtualization,fbertux/meta-virtualization,cardoe/meta-virtualization,lgirdk/meta-virtualization,lgirdk/meta-virtualization,lgirdk/meta-virtualization,cardoe/meta-virtualization,fbertux/meta-virtualization,rcwoolley/meta-virtualization,cjp256/meta-virtualization,cjp256/meta-virtualization,lgirdk/meta-virtualization,cardoe/meta-virtualization,fbertux/meta-virtualization,cjp256/meta-virtualization