Obsolete persistent locks after removing FreeBSD support

[Tomasz Gromadzki]

ISSUE: Obsolete persistent locks after removing FreeBSD support

Environment Information

• PMDK package version(s): 1.13.1

Please provide a reproduction of the bug:

	PMEMmutex_internal *mutex_head;
	PMEMrwlock_internal *rwlock_head;
	PMEMcond_internal *cond_head;

Locks are no longer needed after FreeBSD support but must stay as they are part of the pmempool header.

[Tomasz Gromadzki]

Removal of bsd_u from padded_pmemmutex to be considered:

typedef union padded_pmemmutex {
	char padding[_POBJ_CL_SIZE];
	struct {
		uint64_t runid;
		union {
			os_mutex_t mutex;
			struct {
				void *bsd_mutex_p;
				union padded_pmemmutex *next;
			} bsd_u;
		} mutex_u;
	} pmemmutex;
} PMEMmutex_internal;