[Bug 199119] libmd conflicts with libcrypto

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=199119

            Bug ID: 199119
           Summary: libmd conflicts with libcrypto
           Product: Base System
           Version: 10.1-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: thomas at FreeBSD.org

libmd provides symbols that have the same name, but (presumably) are not
compatible, with libcrypto.

As a result, a program linked against libmd cannot connect to an LDAP server
using SSL, because libldap will resolve symbols in libmd, whereas it expects
those from libcrypto.

An annoying collateral is that crontab(1) will hang when using nss_ldap,
because it is linked against libmd to get MD5.

Various solutions are possible:
  * link libmd statically in crontab(1)
  * add -lcrypto before -lmd when linking crontab(1)
  * make libmd symbols consistent (ABI-compatible) with those in libcrypto
  * use different syumbol names in libmd to avoid the clash
  * remove libmd symbols that duplicate functionality from libcrypto
  * deprecate libmd altogether and use other hash functions from libcrypto.

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