SDL_dynapi.h: revert commit ee88fe3e353e in order to enable dynapi

[ optional ]

src/dynapi/SDL_dynapi.h

@@ -55,8 +55,6 @@
 #define SDL_DYNAMIC_API 0
 #elif defined(__clang_analyzer__)
 #define SDL_DYNAMIC_API 0  /* Turn off for static analysis, so reports are more clear. */
-#elif defined(__OS2__)
-#define SDL_DYNAMIC_API 0
 #endif
 
 /* everyone else. This is where we turn on the API if nothing forced it off. */