Properly support STATIC_SDL make flag.

src/conio/Common.bmake

 !ifdef USE_SDL
 CIOLIB-MT_CFLAGS = $(CIOLIB-MT_CFLAGS) -DWITH_SDL -DWIN32 -IC:$(DIRSEP)SDL$(DIRSEP)SDL-1.2.9$(DIRSEP)include
+!ifdef STATIC_SDL
+CIOLIB-MT_CFLAGS = $(CIOLIB-MT_CFLAGS) -DSTATIC_SDL
+!endif
 !endif

src/conio/Common.gmake

@@ -34,11 +34,12 @@ ifdef WITH_SDL
    CIOLIB-MT_CFLAGS	+=	$(shell $(SDL_CONFIG) --cflags)
    ifdef STATIC_SDL
     CIOLIB-MT_LIBS	+=	$(shell $(SDL_CONFIG) --static-libs)
+    CIOLIB-MT_CFLAGS	+=	-DSTATIC_SDL
    endif
   endif
  else
   ifeq ($(os),darwin)
-   CIOLIB-MT_CFLAGS	+=	-DWITH_SDL
+   CIOLIB-MT_CFLAGS	+=	-DWITH_SDL -DSTATIC_SDL
    CIOLIB-MT_CFLAGS	+=	-I/Library/Frameworks/SDL.framework/Headers
    CIOLIB-MT_LIBS	+=	-framework SDL -framework Cocoa -framework Carbon -I/Library/Frameworks/SDL.framework/Headers
   endif