Merge pull request #3642 from aobolensk/private/aobolensk/fix_demos_cmake_on_armhf7

Fix demos build on armv7

Author: Wovchena

demos/CMakeLists.txt

@@ -61,7 +61,7 @@ elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^(arm.*|ARM.*)")
   set(ARM ON)
 endif()
 if(ARM AND NOT CMAKE_CROSSCOMPILING)
-    add_compile_options(-march=armv7-a)
+    add_compile_options(-march=armv7-a+fp)
 endif()
 
 set(CMAKE_CXX_STANDARD 11)