mariadb-10.2 @10.2.12: opportunistic use of numerous libraries and programs

[ryandesign (Ryan Carsten Schmidt)]

mariadb-10.2 finds and uses a number of things if present, though it does not declare dependencies on them:

• pkg-config
• boost
• bzip2
• cracklib (crack.h)
• gdb (bfd.h)
• git
• kerberos5 (GSSAPI)
• libxml2
• lzo2
• openssl
• pcre
• snappy (snappy-c.h)
• xz (liblzma)
• and something do with with ODBC (ODBC_OK)

One or more of these is causing the build to fail for me, unless I use trace mode. The port should declare dependencies on whichever of these it wants to use, and add flags or whatever to prevent the use of the others.

I did not test other mariadb versions but assume at least some of this applies to them too.