build: Avoid using CMAKE_BINARY_DIR

Using CMAKE_BINARY_DIR was breaking the use of this repo as a
submodule because the top level binary directory is different when
build as part of another repo.

diff --git a/demos/CMakeLists.txt b/demos/CMakeLists.txt
index 8b6464e..e7db053 100644 (file)
--- a/demos/CMakeLists.txt
+++ b/demos/CMakeLists.txt
@@ -1,6 +1,6 @@
 set(DEMO_INCLUDE_DIRS
     ${CMAKE_CURRENT_BINARY_DIR}
-    ${CMAKE_BINARY_DIR}
+    ${CMAKE_CURRENT_BINARY_DIR}/..
 )
 
 if(CMAKE_SYSTEM_NAME STREQUAL "Windows")