优化cmake配置文件, 添加必要头文件 (#2558)

- enable_server cmake选项生效;
- enable_tests 选项在api目录下的test同样生效;
- 增加stdio.h 防止编译失败;

api/tests/CMakeLists.txt

@@ -43,15 +43,3 @@ foreach(TEST_SRC ${TEST_SRC_LIST})
   target_link_libraries(${exe_name} mk_api)
   target_compile_options(${exe_name} PRIVATE ${COMPILE_OPTIONS_DEFAULT})
 endforeach()
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api/tests/pusher.c

@@ -9,6 +9,7 @@
  */
 
 #include <string.h>
+#include <stdio.h>
 #include "mk_mediakit.h"
 
 typedef struct {

api/tests/server.c

@@ -9,6 +9,7 @@
  */
 
 #include <string.h>
+#include <stdio.h>
 #include "mk_mediakit.h"
 #define LOG_LEV 4