Fix openh264 compile error on MacOS

src/common/common.cpp

@@ -0,0 +1,6 @@
+#include "common.h"
+
+int CommonDummy()
+{
+    return 0;
+}

src/common/common.h

@@ -3,6 +3,8 @@
 
 #include <iostream>
 
+int CommonDummy();
+
 constexpr size_t HASH_STRING_PIECE(const char *string_piece) {
   std::size_t result = 0;
   while (*string_piece) {

src/log/log.cpp

@@ -0,0 +1,6 @@
+#include "log.h"
+
+int LogDummy()
+{
+    return 0;
+}

src/log/log.h

@@ -31,6 +31,8 @@ constexpr auto LOGGER_NAME = "siganl";
 constexpr auto LOGGER_NAME = "rtc";
 #endif
 
+int LogDummy();
+
 #define LOG_INFO(...)                                                         \
   if (nullptr == spdlog::get(LOGGER_NAME)) {                                  \
     auto now = std::chrono::system_clock::now() + std::chrono::hours(8);      \

src/ringbuffer/ringbuffer.cpp

@@ -0,0 +1,6 @@
+#include "ringbuffer.h"
+
+int RingBufferDummy()
+{
+    return 0;
+}

src/ringbuffer/ringbuffer.h

@@ -3,6 +3,8 @@
 
 #include <string.h>
 
+int RingBufferDummy();
+
 class Data {
  public:
   Data() = default;