spec: use "or" instead of "/" in License line
spec: use "or" instead of "/" in License line

rpmlint on Fedora 31 complains about "LGPLv2+ / MIT" because "/" is not
allowed.  Use "or" instead.

Fixes: 783831a0548d3c702bd18746b5f425106f10e090
       ("Include MIT notice in rpm spec and debian package file")
Signed-off-by: Stefan Hajnoczi <484520986196e4a799496429ce8a499eb6488adb@redhat.com>
Signed-off-by: Jens Axboe <cd8c6775e60d6f67a6984377324e5290df3d5358@kernel.dk>

axboe/liburing,axboe/liburing,axboe/liburing