Enable make install (#1335)

With the new build system, the conventional `cmake && make` already
works. However, the last step, i.e., `make install` was still
missing (didn't work). This patch adds the `install()` commands to
CMakeLists that are required to generate the `install` target in
the Makefile.

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

jerry-core/CMakeLists.txt

@@ -208,3 +208,6 @@ endif()
 if (JERRY_LIBM)
   target_include_directories(${JERRY_CORE_NAME} SYSTEM PRIVATE "${CMAKE_SOURCE_DIR}/jerry-libm/include")
 endif()
+
+install(TARGETS ${JERRY_CORE_NAME} DESTINATION lib)
+install(FILES jerry-api.h jerry-port.h DESTINATION include)