Add better support for proper installation after build (#2370)

- Add `--install` option to `tools/build.py`.
- Make use of `--install` in `tools/run-tests.py` by testing the
  installed the executables instead of those in the build tree.

Related changes:
- Collect unit test binaries in the `tests` subdir of the build
  tree instead of `bin`.
- The `ls`-based collection of the unit test binaries had some
  shortcomings hitherto unrevealed (it didn't filter for files so
  it could potentially "collect" dictionaries, too), which has now
  been replaced with a more stable `find`-based solution.

JerryScript-DCO-1.0-Signed-off-by: Akos Kiss akiss@inf.u-szeged.hu

tests/unit-ext/CMakeLists.txt

@@ -28,8 +28,8 @@ foreach(SOURCE_UNIT_TEST_EXT ${SOURCE_UNIT_TEST_EXT_MODULES})
   set(TARGET_NAME unit-${TARGET_NAME})
 
   add_executable(${TARGET_NAME} ${SOURCE_UNIT_TEST_EXT})
-  set_property(TARGET ${TARGET_NAME}
-               PROPERTY LINK_FLAGS "${LINKER_FLAGS_COMMON}")
+  set_property(TARGET ${TARGET_NAME} PROPERTY LINK_FLAGS "${LINKER_FLAGS_COMMON}")
+  set_property(TARGET ${TARGET_NAME} PROPERTY RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/tests")
 
   target_link_libraries(${TARGET_NAME} jerry-ext jerry-core jerry-port-default-minimal)