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

CMakeLists.txt

@@ -131,17 +131,12 @@ message(STATUS "DOCTESTS                    " ${DOCTESTS})
 message(STATUS "FEATURE_INIT_FINI           " ${FEATURE_INIT_FINI})
 
 # Setup directories
-# Project binary dir
-set(PROJECT_BINARY_DIR "${CMAKE_BINARY_DIR}")
-
-# Library output directory
-set(CMAKE_LIBRARY_OUTPUT_DIRECTORY "${PROJECT_BINARY_DIR}/lib/")
-
-# Executable output directory
-set(CMAKE_RUNTIME_OUTPUT_DIRECTORY "${PROJECT_BINARY_DIR}/bin/")
-
-# Archive targets output Directory
-set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY "${PROJECT_BINARY_DIR}/lib/")
+# Note: This mimics a conventional file system layout in the build directory for
+# the sake of convenient location of build artefacts. Proper installation to
+# traditional locations is also supported, e.g., to /usr/local.
+set(CMAKE_RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/bin/")
+set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/lib/")
+set(CMAKE_LIBRARY_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/lib/")
 
 # Remove rdynamic option
 set(CMAKE_SHARED_LIBRARY_LINK_C_FLAGS )