There is no need specify cmake minimal version in .cmake files

Also fixes building with cmake 3.x

IoT.js-DCO-1.0-Signed-off-by: Yonggang Luo luoyonggang@gmail.com

Author: lygstate

cmake/JSONParser.cmake

@@ -34,8 +34,6 @@
 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 # SOFTWARE.
 
-cmake_minimum_required(VERSION 2.8)
-
 if (DEFINED JSonParserGuard)
   return()
 endif()

cmake/http-parser.cmake

@@ -12,8 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-cmake_minimum_required(VERSION 2.8)
-
 if("${TARGET_OS}" MATCHES "NUTTX|TIZENRT")
   set(HTTPPARSER_NUTTX_ARG -DNUTTX_HOME=${TARGET_SYSTEMROOT})
 endif()

cmake/iotjs.cmake

@@ -12,8 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-cmake_minimum_required(VERSION 2.8)
-
 if(NOT DEFINED PYTHON)
   set(PYTHON "python")
 endif()

cmake/jerry.cmake

@@ -12,8 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-cmake_minimum_required(VERSION 2.8)
-
 # Host jerry for snapshot generation
 set(DEPS_HOST_JERRY deps/jerry-host)
 ExternalProject_Add(hostjerry

cmake/libtuv.cmake

@@ -12,8 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-cmake_minimum_required(VERSION 2.8)
-
 # Configure external libtuv
 set(DEPS_TUV deps/libtuv)
 set(DEPS_TUV_SRC ${ROOT_DIR}/${DEPS_TUV})
@@ -58,13 +56,14 @@ set(TUV_LIBS tuv)
 
 if("${TARGET_OS}" STREQUAL "MOCK" OR
    "${TARGET_OS}" STREQUAL "LINUX")
-  list(APPEND TUV_LIBS pthread)
+  target_link_libraries(tuv INTERFACE pthread)
 elseif("${TARGET_OS}" STREQUAL "WINDOWS")
-  list(APPEND TUV_LIBS
-        ws2_32.lib
-        UserEnv.lib
-        advapi32.lib
-        iphlpapi.lib
-        psapi.lib
-        shell32.lib)
+  target_link_libraries(tuv INTERFACE
+    ws2_32.lib
+    UserEnv.lib
+    advapi32.lib
+    iphlpapi.lib
+    psapi.lib
+    shell32.lib
+  )
 endif()

cmake/mbedtls.cmake

@@ -12,8 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-cmake_minimum_required(VERSION 2.8)
-
 set(MODULE_NAME "tls")
 
 if ("${TARGET_OS}" STREQUAL "TIZENRT")