leiningen 2.0.0

Closes #17212.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
vgmstream r1007
boost: add option to use system layout.

Closes #14749.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
New formula: sqlcipher

Closes #16960.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
open-mpi: add MPI_THREAD_MULTIPLE support.

Closes #16956.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
sbcl 1.1.3

Closes #16952.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
sbcl: 1.1.3 bottles.
flann 1.8.2

Closes #16724.
exempi: note that patch has been merged upstream
pxz: requires openmp, not available in clang

Closes #16227.
superenv: favor /opt/X11 over /usr/X11 when both exist

This is the order of precedence used elsewhere in Homebrew when
detecting X11 versions and prefixes.

Fixes #16598.
GnuTLS2 2.12.21

Adding GnuTLS 2.x
GnuTLS 3.x changed the API slightly, but also changes license terms,
so it is unlikely that some software will update to newer versions.

Closes #17109.
Wireshark: link against GnuTLS 2

Closes #16257.
mutt: remove unused flag
rbenv-bundler: fix updated 0.95 tag.
mjpegtools: depend on X11 if installed.

Closes #17222.