package/libftdi1: fix swig build error when using cmake 3.12

The build fails with 'Unable to find' swig.swg and python.swg when
using cmake version 3.12.

This commit adds a patch from upstream libftdi.

Fixes:
  http://autobuild.buildroot.net/results/cc54fec0cd6e35e99dde2f43e0eb28b9d628cd19

Signed-off-by: Mark Corbin <mark.corbin@embecosm.com>
Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit f5e81203144ce9d8f8acb69de38c487b2bbe398f)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/libftdi1/0004-cmake-find-swig.patch

@@ -0,0 +1,26 @@
+From fcda9c6a208d3a7fe651ef661b2eb6e462a89c17 Mon Sep 17 00:00:00 2001
+From: Eneas U de Queiroz <cote2004-github@yahoo.com>
+Date: Tue, 31 Jul 2018 17:44:57 -0300
+Subject: [PATCH] CMake: use find_package (SWIG) for cmake >= 3.0.0
+
+There's a workaround for a bug (fixed in cmake 3.0.0) that does not
+work in CMake 3.12.  Only use the workaround with cmake < 3.0.0.
+
+Signed-off-by: Eneas U de Queiroz <cote2004-github@yahoo.com>
+[Mark: patch retrieved and updated from
+http://developer.intra2net.com/git/?p=libftdi;a=commit;h=fcda9c6a208d3a7fe651ef661b2eb6e462a89c17]
+Signed-off-by: Mark Corbin <mark.corbin@embecosm.com>
+---
+diff --git a/python/CMakeLists.txt b/python/CMakeLists.txt
+index 31ef1c6..eefc344 100644
+--- a/python/CMakeLists.txt
++++ b/python/CMakeLists.txt
+@@ -3,7 +3,7 @@ option ( LINK_PYTHON_LIBRARY "Link against python libraries" ON )
+ 
+ if ( PYTHON_BINDINGS )
+   # workaround for cmake bug #0013449
+-  if ( NOT DEFINED CMAKE_FIND_ROOT_PATH )
++  if ( NOT DEFINED CMAKE_FIND_ROOT_PATH OR CMAKE_VERSION VERSION_GREATER_EQUAL 3.0.0 )
+     find_package ( SWIG )
+   else ()
+     find_program ( SWIG_EXECUTABLE NAMES swig2.0 swig )