(split) COMP: Re-add the FLTK patch for some Macs.

Some Macs still need the FLTK patch.

Change-Id: I95b3659c5bc75501277cf1d051772d1e7a3a64a5
Suggested-by: Bill Lorensen <bill.lorensen@gmail.com>
(split) COMP: Fix FLTK build error on Mac/Clang.

Change-Id: Ifb5ce5aa4021c3634fd82f7dcfc3c8509d4f0504
(split) BUG: ITK External build only depends on VTK if being built.

Change-Id: Ie066a6e60897151f4cd423072c1b88c69ea1ad8e
(split) BUG: Propagate build, linker, and OSX settings to external projects

Change-Id: I5d18375a98eabec9525b04897d53a339abc7d913
(split) Merge topic 'SuperbuildPropagateCMakeArgs2'

a9cbc29 BUG: Propagate build, linker, and OSX settings to external projects
Merge branch 'Superbuild-mac' of /home/matt/progs/ITKApps
(split) COMP: Update FLTK SVN configuration.

Upstream FLTK changed their SVN server configuration.  The domain name
has changed and a checkout now requires a blank username and password.

Since the currently released version of CMake does not support an empty
username and password in the SVN checkout, a custom DOWNLOAD_COMMAND
is used for the FLTK ExternalProject.

Change-Id: I9f59b84d585bfcb69ad063534e6f21be8f8f165a
(split) ENH: Bump VTK ExternalProject to 5.10.1.

Change-Id: I13ae6552c597546cd4262171ec683ae582478e8c
Merge branch 'Superbuild-latest' of /home/matt/progs/ITKApps