Add Travis CI jobs for build testing several targets (#2102)

Hitherto, code under the `targets` directory was not tested and so
its maintenance was sometimes speculative. This commit adds build
testing for several targets to prevent them from bit rotting.
Targets covered by this commit are: ESP8266, Mbed, Mbed OS 5,
NuttX, RIOT, Tizen RT, and Zephyr.

Some issues were revealed and fixed:
- ESP8266: added missing include for `uint32_t` typedef.
- Tizen RT: replaced missing `str_to_uint` with `strtol`.

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

.travis.yml

@@ -70,6 +70,47 @@ matrix:
             - gcc-5
             - gcc-5-multilib
       env: OPTS="--jerry-tests --jerry-test-suite --skip-list=parser-oom.js --buildoptions=--compile-flag=-fsanitize=undefined,--compile-flag=-m32,--compile-flag=-fno-omit-frame-pointer,--compile-flag=-fno-common,--debug,--jerry-libc=off,--static-link=off,--system-allocator=on,--linker-flag=-fuse-ld=gold" UBSAN_OPTIONS=print_stacktrace=1 TIMEOUT=600
+
+    - env: JOBNAME="ESP8266 Build Test"
+      cache: ccache
+      install: make -f ./targets/esp8266/Makefile.travis install
+      script: make -f ./targets/esp8266/Makefile.travis script
+    - env: JOBNAME="Mbed/K64F Build Test"
+      addons:
+        apt:
+          sources:
+            - sourceline: ppa:team-gcc-arm-embedded/ppa
+          packages:
+            - gcc-arm-embedded
+      install: make -f ./targets/mbed/Makefile.travis install
+      script: make -f ./targets/mbed/Makefile.travis script
+    - env: JOBNAME="Mbed OS 5/K64F Build Test"
+      addons:
+        apt:
+          sources:
+            - sourceline: ppa:team-gcc-arm-embedded/ppa
+          packages:
+            - gcc-arm-embedded
+      install: make -f ./targets/mbedos5/Makefile.travis install
+      script: make -f ./targets/mbedos5/Makefile.travis script
+    - env: JOBNAME="NuttX/STM32F4 Build Test"
+      install: make -f targets/nuttx-stm32f4/Makefile.travis install
+      script: make -f targets/nuttx-stm32f4/Makefile.travis script
+    - env: JOBNAME="RIOT/STM32F4 Build Test"
+      install: make -f ./targets/riot-stm32f4/Makefile.travis install
+      script: make -f ./targets/riot-stm32f4/Makefile.travis script
+    - env: JOBNAME="Tizen RT/Artik053 Build Test"
+      addons:
+        apt:
+          sources:
+            - sourceline: ppa:team-gcc-arm-embedded/ppa
+          packages:
+            - gcc-arm-embedded
+      install: make -f ./targets/tizenrt-artik053/Makefile.travis install
+      script: make -f ./targets/tizenrt-artik053/Makefile.travis script
+    - env: JOBNAME="Zephyr/Arduino 101 Build Test"
+      install: make -f ./targets/zephyr/Makefile.travis install
+      script: make -f ./targets/zephyr/Makefile.travis script
   allow_failures:
     - env: OPTS="--check-pylint"
   fast_finish: true