Merge pull request #661 from 0ct0cat/master

[MNN:Bugfix] fix complier error on ubuntu 18.04

Author: jxt1234

project/android/build.gradle

@@ -11,6 +11,8 @@ buildscript {
 }
 
 repositories {
+    google()
+    jcenter()
     mavenLocal()
 }
 

test/CMakeLists.txt

@@ -1,5 +1,9 @@
 IF(MNN_BUILD_TEST)
-  file(GLOB_RECURSE Files ${CMAKE_CURRENT_LIST_DIR}/*.cpp ${CMAKE_CURRENT_LIST_DIR}/*.mm)
+  if(APPLE)
+    file(GLOB_RECURSE Files ${CMAKE_CURRENT_LIST_DIR}/*.cpp ${CMAKE_CURRENT_LIST_DIR}/*.mm)
+  else()
+    file(GLOB_RECURSE Files ${CMAKE_CURRENT_LIST_DIR}/*.cpp)
+  endif()
   add_executable(run_test.out ${Files})
   target_link_libraries(run_test.out ${MNN_DEPS})
   target_include_directories(run_test.out PRIVATE ${CMAKE_CURRENT_LIST_DIR}/)