(ITS#6733) LDAP_MEMORY_DEBUG issues

[h.b.furuseth@usit.uio.no]

Full_Name: Hallvard B Furuseth
Version: 2.4.23
OS: 
URL: ftp://ftp.openldap.org/incoming/
Submission from: (NULL) (129.240.6.233)
Submitted by: hallvard


With LDAP_MEMORY_DEBUG,
- ber_memcalloc_x does not check for overflow.
- LBER_MEM_JUNK and the ber_int_mem_hdr initializer get compiler warnings.
Fixing.