package/eigen: bump to 3.3.7

Bumped the version of eigen to 3.3.7, which fixes issues when compiling with GCC7 (notably int-in-bool-context errors, fixed in 3.3.5), in addition to various other issues noted in the eigen change logs: http://eigen.tuxfamily.org/index.php?title=ChangeLog
Legal hashes are unchanged in 3.3.7

Signed-off-by: Reed Nightingale <reed.nightingale@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/eigen/eigen.hash

@@ -1,5 +1,5 @@
 # Locally computed
-sha256 dd254beb0bafc695d0f62ae1a222ff85b52dbaa3a16f76e781dce22d0d20a4a6 3.3.4.tar.bz2
+sha256 9f13cf90dedbe3e52a19f43000d71fdf72e986beb9a5436dddcd61ff9d77a3ce 3.3.7.tar.bz2
 sha256 4f877e5ae4672568ef82cfd0023e2cef4a7cf55d867ab249efc9569a7eb9e5b1 COPYING.BSD
 sha256 8ceb4b9ee5adedde47b31e975c1d90c73ad27b6b165a1dcd80c7c545eb65b903 COPYING.GPL
 sha256 dc626520dcd53a22f727af3ee42c770e56c97a64fe3adb063799d8ab032fe551 COPYING.LGPL

package/eigen/eigen.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-EIGEN_VERSION = 3.3.4
+EIGEN_VERSION = 3.3.7
 EIGEN_SOURCE = $(EIGEN_VERSION).tar.bz2
 EIGEN_SITE = https://bitbucket.org/eigen/eigen/get
 EIGEN_LICENSE = MPL2, BSD-3-Clause, LGPL-2.1