Improve reusability of code that is defined out by cmake build paths

 * Added new ARMNN_STUB_PROFILING and ARMNN_DISABLE_DYNAMIC_BACKEND
   defines to replace BUILD_BARE_METAL and BUILD_EXECUTE_NETWORK_STATIC
 * Add new CMake variables to disable sample apps and dynamic backends
 * Improve BUILD_SHARED_LIBS CMake variable
 * Add new archive output location to various libraries so that the
   static libraries appear in the same location as the shared libraries
 * Fixes for bare metal build
 * Add ARMNN_DISABLE_FILE_SYSTEM defines to missing locations

Signed-off-by: Ryan OShea <ryan.oshea3@arm.com>
Change-Id: I1db9a8f483e7134bd261294b35240cf21b150d45
diff --git a/src/backends/backends.cmake b/src/backends/backends.cmake
index aca3b63..98af271 100644
--- a/src/backends/backends.cmake
+++ b/src/backends/backends.cmake
@@ -19,11 +19,12 @@
     message(STATUS "Including backend into the build: ${includeFile}")
     include(${includeFile})
 endforeach()
-
-# parse dynamic backend sub-directories
-file(GLOB dynamicBackendDirs ${PROJECT_SOURCE_DIR}/src/backends/dynamic/*)
-foreach(dynamicBackendDir ${dynamicBackendDirs})
-    if (EXISTS ${dynamicBackendDir} AND IS_DIRECTORY ${dynamicBackendDir})
-        add_subdirectory(${dynamicBackendDir})
-    endif()
-endforeach()
+if(NOT DISABLE_DYNAMIC_BACKENDS)
+    # parse dynamic backend sub-directories
+    file(GLOB dynamicBackendDirs ${PROJECT_SOURCE_DIR}/src/backends/dynamic/*)
+    foreach(dynamicBackendDir ${dynamicBackendDirs})
+        if (EXISTS ${dynamicBackendDir} AND IS_DIRECTORY ${dynamicBackendDir})
+            add_subdirectory(${dynamicBackendDir})
+        endif()
+    endforeach()
+endif()