Updated OpenSSL used for win32 builds.
Configure: workaround for system perl on OS X (ticket #576).
nginx-1.7.2-RELEASE
release-1.7.2 tag
Version bump.
Core: added ngx_slab_calloc() and ngx_slab_calloc_locked().

These functions return zeroed memory, analogous to ngx_pcalloc().
FreeBSD has migrated to Bugzilla.
Upstream: reduced diffs to the plus version of nginx.

No functional changes.