Currently, pthread spinlock is initialized in macro ASSERT, thus
the spinlock only will be initialized when CLIB_ASSERT_ENABLE is true.
But CLIB_ASSERT_ENABLE depends on CLIB_DEBUG been set.
Mostly, CLIB_DEBUG is zero, so spinlock will never been initialized,
which will lead vpp hang when try to hold the lock.
This patch fix this issue.
Change-Id: If01982b5df849834ccbc705f8e9291f2b6c32d0a
Signed-off-by: Michael Qiu <qiudayu@chinac.com>