Change dllexport'd RENDERDOC_GetAPI to a function pointer typedef

* Apps don't link against renderdoc so a dllexport is meaningless, they
  need a typedef to declare the function pointer they will
  GetProcAddress().

renderdoc/api/app/renderdoc_app.h

@@ -29,29 +29,11 @@
 #endif
 
 #if defined(WIN32)
-
-#if defined(RENDERDOC_EXPORTS)
-#define RENDERDOC_API __declspec(dllexport)
-#else
-#define RENDERDOC_API __declspec(dllimport)
-#endif
-
-#define RENDERDOC_CC __cdecl
-
+	#define RENDERDOC_CC __cdecl
 #elif defined(__linux__)
-
-#ifdef RENDERDOC_EXPORTS
-#define RENDERDOC_API __attribute__ ((visibility ("default")))
+	#define RENDERDOC_CC
 #else
-#define RENDERDOC_API
-#endif
-
-#define RENDERDOC_CC
-
-#else
-
-#error "Unknown platform"
-
+	#error "Unknown platform"
 #endif
 
 #ifdef __cplusplus
@@ -508,6 +490,8 @@ typedef struct
 // RenderDoc API entry point
 // 
 // This entry point can be obtained via GetProcAddress/dlsym if RenderDoc is available.
+// 
+// The name is the same as the typedef - "RENDERDOC_GetAPI"
 //
 // This function is not thread safe, and should not be called on multiple threads at once.
 // Ideally, call this once as early as possible in your application's startup, before doing
@@ -524,7 +508,7 @@ typedef struct
 //   1 - if the outAPIPointers has been filled with a pointer to the API struct requested
 //   0 - if the requested version is not supported or the arguments are invalid.
 //
-RENDERDOC_API int RENDERDOC_CC RENDERDOC_GetAPI(RENDERDOC_Version version, void **outAPIPointers);
+typedef int (RENDERDOC_CC *pRENDERDOC_GetAPI)(RENDERDOC_Version version, void **outAPIPointers);
 
 #ifdef __cplusplus
 }  // extern "C"

renderdoc/replay/app_api.cpp

@@ -28,6 +28,7 @@
 #include "core/core.h"
 #include "hooks/hooks.h"
 #include "api/app/renderdoc_app.h"
+#include "api/replay/renderdoc_replay.h" // for RENDERDOC_API to export the RENDERDOC_GetAPI function
 
 static void SetFocusToggleKeys(RENDERDOC_InputButton *keys, int num)
 {