Squashed 'third_party/eigen/' content from commit 61d72f6

Change-Id: Iccc90fa0b55ab44037f018046d2fcffd90d9d025
git-subtree-dir: third_party/eigen
git-subtree-split: 61d72f6383cfa842868c53e30e087b0258177257
diff --git a/Eigen/src/Geometry/CMakeLists.txt b/Eigen/src/Geometry/CMakeLists.txt
new file mode 100644
index 0000000..f8f728b
--- /dev/null
+++ b/Eigen/src/Geometry/CMakeLists.txt
@@ -0,0 +1,8 @@
+FILE(GLOB Eigen_Geometry_SRCS "*.h")
+
+INSTALL(FILES
+  ${Eigen_Geometry_SRCS}
+  DESTINATION ${INCLUDE_INSTALL_DIR}/Eigen/src/Geometry COMPONENT Devel
+  )
+
+ADD_SUBDIRECTORY(arch)